Experimental Study of Chalconatronite: From Its Identification to the Treatment of Copper Alloy Objects

IF 2 0 HUMANITIES, MULTIDISCIPLINARY Heritage Pub Date : 2024-06-01 DOI:10.3390/heritage7060135
Charlène Pelé-Meziani, Aymeric Raimon, J. Mevellec, Elodie Guilminot
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Abstract

On the occasion of the reopening of the Dobrée Museum (Nantes, France), two statuettes of Egyptian origin, representing Harpocrate and Isis, were studied to shed light on the presence of the blue-green efflorescence on their surface. The efflorescence on the Harpocrate statuette was identified as being chalconatronite, while that which was present on the Isis statuette corresponded to sodium copper formate/acetate, probably due to the evolution of chalconatronite in an environment containing VOCs. The efflorescence appeared to be sensitive to the cyclic variation in relative humidity whereas it seemed stable. An experimental curative treatment to halt the reappearance was carried out. A series of pure water baths extracted a significant quantity of sodium. The treatment appeared effective and reduced the risk of a recrudescence of the efflorescence for both statuettes. However, when the efflorescence was dissolved on the Isis statuette, other compounds appeared to react with water, leading to acidification and a potential reaction with the lead in the alloy. A layer of lead carbonate/acetate on the surface appeared. The objects were then dried and protected with a highly concentrated acrylic varnish. They are currently being monitored to identify any new efflorescence that may appear during display.
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铬铁矿的实验研究:从铜合金物体的识别到处理
在多布雷博物馆(法国南特)重新开放之际,我们对代表哈波克拉特和伊希斯的两尊埃及雕像进行了研究,以揭示其表面是否存在蓝绿色荧光。经鉴定,哈波克拉特雕像上的鳞片为辉铜矿,而伊希斯雕像上的鳞片则为甲酸铜/乙酸钠,这可能是由于辉铜矿在含有挥发性有机化合物的环境中演变所致。风化现象似乎对相对湿度的周期性变化很敏感,但它似乎很稳定。为了阻止这种现象再次出现,我们进行了实验性处理。一系列的纯水浴提取了大量的钠。这种处理方法似乎很有效,降低了两座雕像再次出现风化的风险。然而,当溶解伊希斯雕像上的沉积物时,其他化合物似乎与水发生了反应,导致酸化并可能与合金中的铅发生反应。表面出现了一层碳酸铅/醋酸盐。随后,这些文物被烘干,并用高浓度丙烯酸清漆加以保护。目前正在对它们进行监测,以确定在展示期间可能出现的新的风化现象。
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来源期刊
Heritage
Heritage Multiple-
CiteScore
2.90
自引率
17.60%
发文量
165
审稿时长
10 weeks
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