Nickel Silver: Nickel Silver (白铜)
A copper-nickel-zinc alloy with a silvery colour and better corrosion resistance than ordinary brass. It is used for premium metal zippers where a bright, white-metal look is required without heavy plating. Nickel silver is harder and more expensive, so it is chosen for high-end bags, denim and fashion hardware. Composition, hardness and surface finish are controlled, and nickel release is tested for skin-contact applications.