A Establishment and Evaluation of a Conservation Treatment for Old Coins Attacked with Bronze Disease, mainly caused by Atacamite.

分析corrosion products on excavated old Islamic coins:The X-ray diffraction Analysis ofthe corrosion products that were back to Japan showed that the coins had active bronzedise-ase,mainly caused by Atacamite.2. Choice of cleaning agent：它是不可接受的，以删除rust byuseing mechanical methods because of the number of coins and the short period available forTherefore chelating agents required for chemical treatment，have been used recently for the removal of corrosion products of the copper alloy.From theexperiment,it became clear the Gluconic acid chelating agenent was suitable for long period steepingEDTA 3na was good for short period steeping.3. The effects of treatment by desalting andstabilization depending on the difference of corrosion products:1000 coins分类into 9types according to their surface corrosion products30种类型的硬币被选择从每个类型。这些被examined to see the effects ofdesalting and stabilization. The results made clear that The corrosion产品attacked with bronzedisease should be removed as much as possible.4.评估方法for conservation treatment：The amount of agents and chloride remaining was checked by measuring The water with pH，sodium ions and chlorine ions that the coins washed in. the effect of the treatment wasmeasureed by examining the coins after putting them under high humidity.A guide for conservationtreatment process:The guide is made for beginners who would like to do this treatment谁就像给treatment proper application。

1. Analysis of corrosion products on excavated old Islamic coins :The X-ray diffraction analysis of the corrosion products that were brought back to Japan showed that the coins had active bronze dise-ase, mainly caused by Atacamite.2. Choice of cleaning agent :It was imposible to remove the rust by useing mechanical methods because of the number of coins and the short period available for treatment. Therefore chelating agents were required for chemical treatment, which have been used recently for the removal of corrosion products of the copper alloy.From the experiment, it became clear that the Gluconic acid chelating agenent was suitable for long period steeping, and EDTA・3Na was good for short period steeping.3. The effects of treatment by desalting and stabilization depending on the difference of corrosion products :1000 coins were classified into 9 types according to their surface corrosion products, and 30 typical coins were selected from each type. These were examined to see the effects of desalting and stabilization. The results made clear that the corrosion products attacked with bronze disease should be removed as much as possible.4. The evaluation method for conservation treatment :The amount of agents and chloride remaining was checked by measuring the water with pH, sodium ions and chlorine ions that the coins were washed in. The effect of the treatment was measureed by examining the coins after putting them under high humidity.A guide for conservation treatment process :The guide is made for beginners who would like to do this treatment, and who would like to ensure proper application of the treatment.