A, copper alloy (white copper, copper, brass) made of metal zipper discoloration Reason:
Used in metal products or wool products, metal zipper will cause some of the teeth to become black phenomenon because of the oxidation of leather, the processing of the cooked skin and wool-woven products, such as bleaching agent, the processing of the residue in the product, its product gas will cause metal zipper discoloration.
B, Rubber band bundle Metal zipper discoloration Reason:
The rubber band itself contains sulfide, with a rubber band bundle metal zipper, the metal chain teeth will produce vulcanization phenomenon (black).
C. Causes of discoloration caused by contact with acidic compounds or chromium compounds.
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