BRONZE OBJECTS

Objects of copper or copper alloys usually develop corrosion in the form of copper(I) oxide, malachite and paracamite (Fig. 1). These objects were cleaned mechanically and with alkaline-based chemicals (Fig. 2). Cleaned objects with deeply penetrated corrosion were put in humidity chamber for 24 hours under pressure for passivation of corrosion and then inhibitor benzatriazole (BTA) was applied for long-term protection. Following the abovementioned methods, all the objects were coated with 3% paraloid B-72 in order to minimise the contact with the environmental conditions. Finally, all the objects were placed in packs together with silica gel in order to balance their humidity and turned over to the storehouse.

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