Zippers are ubiquitous in daily life, and metal zippers are often seen, commonly used on jeans, coats, and backpacks. And metal zippers often have discoloration, so why does metal zipper discolor and how can we prevent it?

Reasons for discoloration of metal zippers:

a. Binding the metal chain with sulfide containing Rubber band will lead to vulcanization (blackening) of the chain teeth.

b. A metal zipper made of copper alloy (white copper, red copper, brass), when used on metal or wool products, may cause some teeth to turn black due to metal oxidation. This is because during the processing of leather ripening agents and processing bleach on woolen products, the residual gas in the product can cause discoloration of the metal zipper.

c. Although the metal zipper head has undergone rust prevention treatment in advance, oxidation is a metal property. To reduce discoloration and surface scratches, please wrap the metal zipper head in copy paper.

d. Causes of discoloration caused by contact with acidic or chromium compounds.