K. Drábková, J. Krejčí, M. Škrdlantová, M. Ďurovič, B. Bacílková
Abstract Textiles are frequently used in bookbinding or for attaching pendent seals and thus they are an integral part of archival and library items. Any part of these items can be contaminated by various microorganisms. Consequently, it is often necessary to include disinfection procedures in the initial stages of the conservation process. Primarily, the agents employed in conservation must not harm the treated material. This work was concerned with monitoring the effect of selected disinfectant agents (ethylene oxide, Septonex®, glutaraldehyde, Bacillol® AF, butanol vapours, Acticide® MV, silver nanoparticles, Chiroseptol®) on the properties and long-term stability of natural textile fibres (cotton and silk). The disinfected textiles were subjected to three kinds of artificial ageing (dry heat, moist heat, and light) and their properties were determined by means of the total colour difference, thread tensile strength and the limiting viscosity number.
{"title":"Influence of Disinfectants on Natural Textile Fibres","authors":"K. Drábková, J. Krejčí, M. Škrdlantová, M. Ďurovič, B. Bacílková","doi":"10.1515/res-2021-0002","DOIUrl":"https://doi.org/10.1515/res-2021-0002","url":null,"abstract":"Abstract Textiles are frequently used in bookbinding or for attaching pendent seals and thus they are an integral part of archival and library items. Any part of these items can be contaminated by various microorganisms. Consequently, it is often necessary to include disinfection procedures in the initial stages of the conservation process. Primarily, the agents employed in conservation must not harm the treated material. This work was concerned with monitoring the effect of selected disinfectant agents (ethylene oxide, Septonex®, glutaraldehyde, Bacillol® AF, butanol vapours, Acticide® MV, silver nanoparticles, Chiroseptol®) on the properties and long-term stability of natural textile fibres (cotton and silk). The disinfected textiles were subjected to three kinds of artificial ageing (dry heat, moist heat, and light) and their properties were determined by means of the total colour difference, thread tensile strength and the limiting viscosity number.","PeriodicalId":21154,"journal":{"name":"Restaurator. International Journal for the Preservation of Library and Archival Material","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/res-2021-0002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48163776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ana Teresa Guimarães Romero, T. Matsui, Eriko Nagahama
Abstract This paper describes an investigation on the storage environment of an Edo period woodblock print collection in terms of volatile organic acid content, using active air sampling and precision gas detector tubes that can measure organic acid emissions in the low microgram range, and evaluates an organic acid mitigation method based on the fan filter unit (FFU) system. Ion-exchange chromatography method was also employed for estimation of acetic and formic acid ratio. Findings revealed an organic acid-concentrated microclimate inside the storage box, nevertheless, the off-gassing rates of the woodblock prints were low, with the exception of a print positioned in the middle of the stack. The acetic acid/formic acid ratio was similar between the storage room environment and inside the storage box, but comparatively higher levels of formic acid were identified in the mulberry paper folder housing the prints. Finally, the FFU system was able to reduce organic acid concentrations inside the storage box for a 5-month observation period, but it did not eliminate the tendency of the storage materials to create organic acid-concentrated microclimates.
{"title":"Investigation on the Organic Acid Content inside the Storage of a Woodblock Print Collection and Evaluation on the FFU System as a Mitigation Strategy","authors":"Ana Teresa Guimarães Romero, T. Matsui, Eriko Nagahama","doi":"10.1515/res-2020-0007","DOIUrl":"https://doi.org/10.1515/res-2020-0007","url":null,"abstract":"Abstract This paper describes an investigation on the storage environment of an Edo period woodblock print collection in terms of volatile organic acid content, using active air sampling and precision gas detector tubes that can measure organic acid emissions in the low microgram range, and evaluates an organic acid mitigation method based on the fan filter unit (FFU) system. Ion-exchange chromatography method was also employed for estimation of acetic and formic acid ratio. Findings revealed an organic acid-concentrated microclimate inside the storage box, nevertheless, the off-gassing rates of the woodblock prints were low, with the exception of a print positioned in the middle of the stack. The acetic acid/formic acid ratio was similar between the storage room environment and inside the storage box, but comparatively higher levels of formic acid were identified in the mulberry paper folder housing the prints. Finally, the FFU system was able to reduce organic acid concentrations inside the storage box for a 5-month observation period, but it did not eliminate the tendency of the storage materials to create organic acid-concentrated microclimates.","PeriodicalId":21154,"journal":{"name":"Restaurator. International Journal for the Preservation of Library and Archival Material","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/res-2020-0007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48177247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract This study investigated the factors hindering information resources preservation and the extent to which information services are affected in academic libraries. The population consisted of 170 library staff who were conveniently selected from the seven academic libraries under study. The researchers prepared a well-structured questionnaire for data collection and the responses were subjected into SPSS version 20 and content analysis. Findings revealed that lack of awareness, inappropriate building, and lack of preservation plan and being unsure on how to get started, being unsure on how to protect digital information resources and inadequate funding are the factors hindering effective preservation in academic libraries in Tanzania. The study also revealed that lack of information resources preservation affects library services to a great extent. The study concludes that damage of information resources affected information services. The study recommends that academic libraries management in collaboration with other stakeholders should establish a preservation consortium that will oversee the preservation issues in academic libraries country wide that may reduce the extent to which the barriers of information resources preservation affects the information services in the country. Through this consortium experts in the field of preservation will share skills on how they could tackle the preservation challenges together.
{"title":"Information Resources Preservation: Bottlenecks and their Effect on Library Information Services","authors":"Christian. Mubofu, H. Mambo, A. Samzugi","doi":"10.1515/res-2020-0015","DOIUrl":"https://doi.org/10.1515/res-2020-0015","url":null,"abstract":"Abstract This study investigated the factors hindering information resources preservation and the extent to which information services are affected in academic libraries. The population consisted of 170 library staff who were conveniently selected from the seven academic libraries under study. The researchers prepared a well-structured questionnaire for data collection and the responses were subjected into SPSS version 20 and content analysis. Findings revealed that lack of awareness, inappropriate building, and lack of preservation plan and being unsure on how to get started, being unsure on how to protect digital information resources and inadequate funding are the factors hindering effective preservation in academic libraries in Tanzania. The study also revealed that lack of information resources preservation affects library services to a great extent. The study concludes that damage of information resources affected information services. The study recommends that academic libraries management in collaboration with other stakeholders should establish a preservation consortium that will oversee the preservation issues in academic libraries country wide that may reduce the extent to which the barriers of information resources preservation affects the information services in the country. Through this consortium experts in the field of preservation will share skills on how they could tackle the preservation challenges together.","PeriodicalId":21154,"journal":{"name":"Restaurator. International Journal for the Preservation of Library and Archival Material","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/res-2020-0015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49608105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Haomiao Li, L. Severini, Mattia Titubante, D. Gong, L. Micheli, C. Mazzuca, Yuxuan Gong
Abstract Aqueous cleaning of works of art on paper is one of the most important and delicate steps in a conservation process. It allows the removal of inorganic (metals) and organic substances, such as degradation products and other contaminants. These substances are responsible for yellowing, weakening, and loss of mechanical properties of paper. In this article, the cleaning effect of gellan gum was assessed on xuan paper, a traditional Chinese paper different in composition and papermaking technology compared to many Western papers. To assess the effect of gellan gum on xuan paper, its characteristics were studied before and after cleaning utilizing non-invasive and micro-invasive techniques. Results were compared to those obtained when treating Western papers and indicated that gellan gum can be applied effectively for aqueous cleaning of xuan paper.
{"title":"Gellan Gum Hydrogel as an Aqueous Treatment Method for Xuan Paper","authors":"Haomiao Li, L. Severini, Mattia Titubante, D. Gong, L. Micheli, C. Mazzuca, Yuxuan Gong","doi":"10.1515/res-2020-0010","DOIUrl":"https://doi.org/10.1515/res-2020-0010","url":null,"abstract":"Abstract Aqueous cleaning of works of art on paper is one of the most important and delicate steps in a conservation process. It allows the removal of inorganic (metals) and organic substances, such as degradation products and other contaminants. These substances are responsible for yellowing, weakening, and loss of mechanical properties of paper. In this article, the cleaning effect of gellan gum was assessed on xuan paper, a traditional Chinese paper different in composition and papermaking technology compared to many Western papers. To assess the effect of gellan gum on xuan paper, its characteristics were studied before and after cleaning utilizing non-invasive and micro-invasive techniques. Results were compared to those obtained when treating Western papers and indicated that gellan gum can be applied effectively for aqueous cleaning of xuan paper.","PeriodicalId":21154,"journal":{"name":"Restaurator. International Journal for the Preservation of Library and Archival Material","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/res-2020-0010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49250074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-01DOI: 10.1515/res-2020-frontmatter4
{"title":"Frontmatter","authors":"","doi":"10.1515/res-2020-frontmatter4","DOIUrl":"https://doi.org/10.1515/res-2020-frontmatter4","url":null,"abstract":"","PeriodicalId":21154,"journal":{"name":"Restaurator. International Journal for the Preservation of Library and Archival Material","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/res-2020-frontmatter4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48995778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Brostoff, Cynthia Connelly Ryan, Isabella Black
Abstract This study explores the natural alteration of verdigris, both in the form of neutral verdigris (Cu(II) (CH3COO)2⋅H2O) and basic verdigris (Cu(II)x(CH3COO)y(OH)z ⋅nH2O), through combined Raman spectroscopy and X-ray diffraction investigation of samples created seven to eleven years prior to analysis. The naturally aged paint films of neutral or basic verdigris in gum arabic on paper and parchment provide insight into the pigment’s well-known instability relevant to historical works in aqueous media on maps, prints, books and manuscript materials. The latter historical application is an area that has received far less attention than alteration of verdigris in oil-based paint films. Findings shed new light on alternate pathways for conversion of neutral verdigris to basic verdigris, including the formation of a previously unknown form of verdigris and amorphous material on alkaline paper substrates. Additionally, we demonstrate for the first time that copper hydroxyl chlorides can form in situ from neutral verdigris, in this case on parchment that has a chlorine-rich surface. These results advance our understanding of neutral verdigris alteration, and complement results from our prior artificial ageing study. Both studies point to neutral verdigris as the historically more important form throughout its heyday. Improved understanding of neutral verdigris instability and its alteration pathways are critical for confident identification of the pigment in historical works, leading to better risk assessment of collections of verdigris-containing heritage, such as maps.
{"title":"Tracing the Alteration of Verdigris Pigment through Combined Raman Spectroscopy and X-ray Diffraction, Part II: Natural Ageing","authors":"L. Brostoff, Cynthia Connelly Ryan, Isabella Black","doi":"10.1515/res-2020-0012","DOIUrl":"https://doi.org/10.1515/res-2020-0012","url":null,"abstract":"Abstract This study explores the natural alteration of verdigris, both in the form of neutral verdigris (Cu(II) (CH3COO)2⋅H2O) and basic verdigris (Cu(II)x(CH3COO)y(OH)z ⋅nH2O), through combined Raman spectroscopy and X-ray diffraction investigation of samples created seven to eleven years prior to analysis. The naturally aged paint films of neutral or basic verdigris in gum arabic on paper and parchment provide insight into the pigment’s well-known instability relevant to historical works in aqueous media on maps, prints, books and manuscript materials. The latter historical application is an area that has received far less attention than alteration of verdigris in oil-based paint films. Findings shed new light on alternate pathways for conversion of neutral verdigris to basic verdigris, including the formation of a previously unknown form of verdigris and amorphous material on alkaline paper substrates. Additionally, we demonstrate for the first time that copper hydroxyl chlorides can form in situ from neutral verdigris, in this case on parchment that has a chlorine-rich surface. These results advance our understanding of neutral verdigris alteration, and complement results from our prior artificial ageing study. Both studies point to neutral verdigris as the historically more important form throughout its heyday. Improved understanding of neutral verdigris instability and its alteration pathways are critical for confident identification of the pigment in historical works, leading to better risk assessment of collections of verdigris-containing heritage, such as maps.","PeriodicalId":21154,"journal":{"name":"Restaurator. International Journal for the Preservation of Library and Archival Material","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/res-2020-0012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48665186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Malešič, J. Kolar, Mitja Denac, Bor Kolar Bačnik
Abstract The focus of this research is the stabilisation of paper with Verdigris, a green copper pigment. Due to its corrosive effects on paper, many important documents, paintings and maps are in danger. The efficiency of several commercially available deacidification agents on paper samples with Verdigris was tested, including magnesium-based Bookkeeper® dispersion, nano calcium hydroxide containing Nanorestore® and CaLoSiL® dispersions as well as a recently developed dispersion of nano calcium carbonate. The antioxidant tetrabutylammonium bromide was tested either alone or in combination with nano calcium based deacidification agents. The effect of the treatments was evaluated using colour, tensile strength, degree of polymerization and pH measurements. The results indicate that acidic degradation does not play a major role during accelerated degradation of paper containing Verdigris with moderately acidic pH value and that oxidative decay could be the main culprit of the decay. The method described, which involves the use of antioxidant tetrabutylammonium bromide in combination with calcium carbonate based deacidification dispersion, was proved to have a superior effect against degradation of paper with Verdigris in comparison to the treatments which involve deacidification agents only. Nano calcium hydroxide based deacidification agents result in high pH values of the paper samples and therefore cannot be advised for use on paper documents.
{"title":"Stabilisation Treatments for Paper with Green Copper Pigment Verdigris","authors":"J. Malešič, J. Kolar, Mitja Denac, Bor Kolar Bačnik","doi":"10.1515/res-2020-0001","DOIUrl":"https://doi.org/10.1515/res-2020-0001","url":null,"abstract":"Abstract The focus of this research is the stabilisation of paper with Verdigris, a green copper pigment. Due to its corrosive effects on paper, many important documents, paintings and maps are in danger. The efficiency of several commercially available deacidification agents on paper samples with Verdigris was tested, including magnesium-based Bookkeeper® dispersion, nano calcium hydroxide containing Nanorestore® and CaLoSiL® dispersions as well as a recently developed dispersion of nano calcium carbonate. The antioxidant tetrabutylammonium bromide was tested either alone or in combination with nano calcium based deacidification agents. The effect of the treatments was evaluated using colour, tensile strength, degree of polymerization and pH measurements. The results indicate that acidic degradation does not play a major role during accelerated degradation of paper containing Verdigris with moderately acidic pH value and that oxidative decay could be the main culprit of the decay. The method described, which involves the use of antioxidant tetrabutylammonium bromide in combination with calcium carbonate based deacidification dispersion, was proved to have a superior effect against degradation of paper with Verdigris in comparison to the treatments which involve deacidification agents only. Nano calcium hydroxide based deacidification agents result in high pH values of the paper samples and therefore cannot be advised for use on paper documents.","PeriodicalId":21154,"journal":{"name":"Restaurator. International Journal for the Preservation of Library and Archival Material","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/res-2020-0001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43438420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The article describes a historic Japanese green pigment which was identified in a painting attributed to the Kano school, dating to the Edo period. According to literature, malachite – which is the common translation of the Japanese term rokushō – has been the most widely used green pigment in Japan over a long period of time. Its colour shade could be modified by the use of different degrees of grinding and by heating the pigment. The green paint layer found in the painting was examined using XRF, SEM-EDS and XRPD, and cross sections. Examinations revealed a heterogeneous paint layer which consists of a mixture of various natural copper-containing minerals, some of which also contain arsenic and other elements. A concluding discussion of pigment nomenclature in Japan raises the question if rokushō may in fact be equated with pure malachite.
{"title":"The Colour of Pine Needles and Nightingales. A Traditional Japanese Copper-based Green Pigment","authors":"Maria Katharina Plate, Sigrid Eyb-Green, W. Baatz","doi":"10.1515/res-2020-0011","DOIUrl":"https://doi.org/10.1515/res-2020-0011","url":null,"abstract":"Abstract The article describes a historic Japanese green pigment which was identified in a painting attributed to the Kano school, dating to the Edo period. According to literature, malachite – which is the common translation of the Japanese term rokushō – has been the most widely used green pigment in Japan over a long period of time. Its colour shade could be modified by the use of different degrees of grinding and by heating the pigment. The green paint layer found in the painting was examined using XRF, SEM-EDS and XRPD, and cross sections. Examinations revealed a heterogeneous paint layer which consists of a mixture of various natural copper-containing minerals, some of which also contain arsenic and other elements. A concluding discussion of pigment nomenclature in Japan raises the question if rokushō may in fact be equated with pure malachite.","PeriodicalId":21154,"journal":{"name":"Restaurator. International Journal for the Preservation of Library and Archival Material","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/res-2020-0011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48080953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The aim of this research was an investigation into creating a rigid gel application of benzotriazole (BTA), a complexing agent, as a new potential way of treating verdigris-damaged paper. Various gel recipes were mixed and tested on historical samples. The gel recipes varied in gellan gel concentration, BTA/solvent solution concentration, and BTA concentration. The recipe effectiveness was assessed using Hulthe’s indicator paper and MQuant™ Test Cu indicator strips, two types of indicator papers which detect free copper ions. The results showed that rigid gel application of BTA is effective in complexing the copper ions which may inhibit further damage to the paper caused by free copper ions. Some of the other effects of the gel were the simultaneous removal of paper discolouration by the gel. Further research is needed to refine the gel recipes as well as the treatment process to prevent or reduce potential tidelines and other possible negative side-effects of gel treatment.
{"title":"The Gel, the Colour, and the Complexing Agent: An Investigation of a Rigid Gel Application of Benzotriazole for Verdigris-Damaged Paper","authors":"Leah Humenuck","doi":"10.1515/res-2019-0027","DOIUrl":"https://doi.org/10.1515/res-2019-0027","url":null,"abstract":"Abstract The aim of this research was an investigation into creating a rigid gel application of benzotriazole (BTA), a complexing agent, as a new potential way of treating verdigris-damaged paper. Various gel recipes were mixed and tested on historical samples. The gel recipes varied in gellan gel concentration, BTA/solvent solution concentration, and BTA concentration. The recipe effectiveness was assessed using Hulthe’s indicator paper and MQuant™ Test Cu indicator strips, two types of indicator papers which detect free copper ions. The results showed that rigid gel application of BTA is effective in complexing the copper ions which may inhibit further damage to the paper caused by free copper ions. Some of the other effects of the gel were the simultaneous removal of paper discolouration by the gel. Further research is needed to refine the gel recipes as well as the treatment process to prevent or reduce potential tidelines and other possible negative side-effects of gel treatment.","PeriodicalId":21154,"journal":{"name":"Restaurator. International Journal for the Preservation of Library and Archival Material","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/res-2019-0027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44483149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To date, there are still many open questions regarding feasible conservation treatments counteracting paper degradation caused by copper-containing pigments, most notably, verdigris. We are therefore delighted to present this issue of Restaurator dedicated to research related to verdigris. To advance our understanding of the processes taking place during ageing of verdigris, we will first present a paper by Lynn Brostoff and Cynthia Connelly Ryan who explored the natural alteration of both neutral and basic forms of the pigment. We will then progress and introduce two approaches to treating verdigris-damaged paper. Leah Humenuck tested a rigid gel application of benzotriazole (BTA), a complexing agent, on historical samples, while Jasna Malešič et al. studied the efficacy of several commercially available deacidification agents as well as the antioxidant tetrabutylammoniumbromide (TBAB). Finally,we conclude this volume with amore art technologically focussed contribution. Maria Plate et al. investigated the green paint layer of a Japanese folding screen from the Edoperiod and discuss on this basis the production, use and designation of historic Japanese green pigments. Within the last 10 years, much effort was dedicated to further research verdigris, and one might think that the time has come to compile findings and move forward to recommendations for specific treatments and conservation methodology in general. Recent studies in art technology allow the conclusion that oftentimes, historic recipes and current sample design might not always match. In her study of the alterations of verdigris published in the first volume of Restaurator 2020, Brostoff and Connelly Ryan give an overview of historical recipes for verdigris and the resulting compounds. The manufacture of verdigris typically involved the corrosion of copper sheets with acetic acid. Additives and different production methods not only produce a variety of blue to green copper compounds, but also two structurally distinct types of verdigris: the neutral copper acetate monohydrate and a series of basic copper acetate hydroxide salts.
{"title":"Editorial","authors":"Sigrid Eyb-Green, U. Henniges","doi":"10.1515/res-2020-0014","DOIUrl":"https://doi.org/10.1515/res-2020-0014","url":null,"abstract":"To date, there are still many open questions regarding feasible conservation treatments counteracting paper degradation caused by copper-containing pigments, most notably, verdigris. We are therefore delighted to present this issue of Restaurator dedicated to research related to verdigris. To advance our understanding of the processes taking place during ageing of verdigris, we will first present a paper by Lynn Brostoff and Cynthia Connelly Ryan who explored the natural alteration of both neutral and basic forms of the pigment. We will then progress and introduce two approaches to treating verdigris-damaged paper. Leah Humenuck tested a rigid gel application of benzotriazole (BTA), a complexing agent, on historical samples, while Jasna Malešič et al. studied the efficacy of several commercially available deacidification agents as well as the antioxidant tetrabutylammoniumbromide (TBAB). Finally,we conclude this volume with amore art technologically focussed contribution. Maria Plate et al. investigated the green paint layer of a Japanese folding screen from the Edoperiod and discuss on this basis the production, use and designation of historic Japanese green pigments. Within the last 10 years, much effort was dedicated to further research verdigris, and one might think that the time has come to compile findings and move forward to recommendations for specific treatments and conservation methodology in general. Recent studies in art technology allow the conclusion that oftentimes, historic recipes and current sample design might not always match. In her study of the alterations of verdigris published in the first volume of Restaurator 2020, Brostoff and Connelly Ryan give an overview of historical recipes for verdigris and the resulting compounds. The manufacture of verdigris typically involved the corrosion of copper sheets with acetic acid. Additives and different production methods not only produce a variety of blue to green copper compounds, but also two structurally distinct types of verdigris: the neutral copper acetate monohydrate and a series of basic copper acetate hydroxide salts.","PeriodicalId":21154,"journal":{"name":"Restaurator. International Journal for the Preservation of Library and Archival Material","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/res-2020-0014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41302604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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