AN INVESTIGATION OF COLOR CHANGES IN CUPRITE LAYER DUE TO APPLICATION OF CHEMICAL REAGENTS IN THE CLEANING OF ARCHAEOLOGICAL COPPER-BASED ARTIFACTS

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SALEHI KAKHKI AHMAD; MORTAZAVI MOHAMMAD; GOLOZAR MOHAMMAD ALI; TALAEE HASAN

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Journal: Maremat & memari-e Iran Year:2014 | Volume:3 | Issue:6 Page(s): 69-77

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Title

AN INVESTIGATION OF COLOR CHANGES IN CUPRITE LAYER DUE TO APPLICATION OF CHEMICAL REAGENTS IN THE CLEANING OF ARCHAEOLOGICAL COPPER-BASED ARTIFACTS

Author(s)

SALEHI KAKHKI AHMAD | MORTAZAVI MOHAMMAD | GOLOZAR MOHAMMAD ALI | TALAEE HASAN | Issue Writer Certificate

Keywords

CUPRITE PATINAQ2

BRONZE ARTIFACTSQ3

CLEANINGQ2

COLORIMETRYQ2

COLOR CHANGEQ2

Abstract

Chemical CLEANING reagents used on archaeological BRONZE ARTIFACTS not only attack the corrosion products but also may cause some visual effects in the patina. There are few investigations on the visual effects of CLEANING reagents and studies have mostly focused on dissolution corrosion products. Regarding archaeological objects as historical documents and aesthetic entities, it is essential to assess the level of treatment damages to both of these aspects. This paper surveys the visual effects (color changes) of cuprous oxide, Cu2O, treated with traditional CLEANING reagents. Artificial CUPRITE PATINA was formed electrochemically on almost pure copper. Samples were immersed in various solutions separately. Color measurement of CUPRITE PATINA was carried out using a colorimeter before and after 1-hour immersion. Solutions used were Calgon, âdisodium ethylene diamine tetra-acetic acid (Na-2EDTA), tetrasodium ethylene diamine tetra-acetic acid (Na-4EDTA), sodium tripolyphosphate (STPP), citric acid, formic acid, alkaline glycerol, alkaline Rochelle slat and distilled water. Na-2EDTA, citric acid and formic acid were found to cause the most visual impact on CUPRITE PATINA as it is possible for human eye to discriminate between the two colors. Alkaline Rochelle slat, alkaline glycerol, Na-4EDTA and distilled water result in less COLOR CHANGEs. Calgon âand STPP caused the least COLOR CHANGEs which could be disregarded.

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APA: Copy

SALEHI KAKHKI, AHMAD, MORTAZAVI, MOHAMMAD, GOLOZAR, MOHAMMAD ALI, & TALAEE, HASAN. (2014). AN INVESTIGATION OF COLOR CHANGES IN CUPRITE LAYER DUE TO APPLICATION OF CHEMICAL REAGENTS IN THE CLEANING OF ARCHAEOLOGICAL COPPER-BASED ARTIFACTS. MAREMAT-E ASAR & BAFT-HAYE TARIKHI-FARHANGI, 3(6), 69-77. SID. https://sid.ir/paper/205217/en

Vancouver: Copy

SALEHI KAKHKI AHMAD, MORTAZAVI MOHAMMAD, GOLOZAR MOHAMMAD ALI, TALAEE HASAN. AN INVESTIGATION OF COLOR CHANGES IN CUPRITE LAYER DUE TO APPLICATION OF CHEMICAL REAGENTS IN THE CLEANING OF ARCHAEOLOGICAL COPPER-BASED ARTIFACTS. MAREMAT-E ASAR & BAFT-HAYE TARIKHI-FARHANGI[Internet]. 2014;3(6):69-77. Available from: https://sid.ir/paper/205217/en

IEEE: Copy

AHMAD SALEHI KAKHKI, MOHAMMAD MORTAZAVI, MOHAMMAD ALI GOLOZAR, and HASAN TALAEE, “AN INVESTIGATION OF COLOR CHANGES IN CUPRITE LAYER DUE TO APPLICATION OF CHEMICAL REAGENTS IN THE CLEANING OF ARCHAEOLOGICAL COPPER-BASED ARTIFACTS,” MAREMAT-E ASAR & BAFT-HAYE TARIKHI-FARHANGI, vol. 3, no. 6, pp. 69–77, 2014, [Online]. Available: https://sid.ir/paper/205217/en

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