Testing the cleaning effectiveness of new ecological aqueous dispersions applied on old icons

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• 作者：Viorica Vasilache^a ; Irina Crina Anca Sandu^b ; ^{irinasandu@uevora.pt" class="auth_mail" title="E-mail the corresponding author} ; Silvea Pruteanu^c ; Ana Teresa Caldeira^b ; Atena Elena Simionescu^d ; Ion Sandu^a ; ^e ; ^{sandu_i03@yahoo.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Deposit/dirt ; Cornification ; Panel painting ; Cleaning tests ; Supernatant ; Indigenous vegetables juice and herbal infusions ; SEM-EDX ; CIE L*a*b* Colorimetry
• 刊名：Applied Surface Science
• 出版年：2016
• 出版时间：30 March 2016
• 年：2016
• 卷：367
• 期：Complete
• 页码：70-79
• 全文大小：3183 K

文摘

Adherent deposits are very aggressive towards ancient heritage paintings since they affect the varnish and the painting's layers, sometimes reaching the preparative layers. The biggest problem to the restorer is their removal without affecting the patina, the transparent varnish (well preserved) and fine colour glazes made during painting. Therefore, their removal requires preliminary cleaning tests that allow the optimization of the cleaning system composition that is going to be used. The study was focused on organic natural systems, as colourless supernatants, some of them used during ages, but insufficiently studied. The paper presents an evaluation of the effectiveness of cleaning varnished icons of the nineteenth century, with complex conservation cases using supernatants derived from aqueous dispersions extracted from vegetables and dry indigenous herbal infusions. Best results, after six consecutive cleaning steps, on tempera old icon was obtained for a mixture made of mature white onion juice + extract of Soapwort flowers + corn silk tea + acacia tea. As a best result after just one cleaning step was obtained for a quaternary mixture composed from mature white onion juice + mature carrot juice + corn silk tea + aqueous extract of Soapwort flowers.