Discoloration of metal zipper teeth
Time：2026-07-27
The chemical properties of copper alloys are such that they undergo chemical reactions when exposed to acids, alkalis, oxidants, or reducing agents, and are prone to discoloration.
The chemical properties of copper alloys are such that they undergo chemical reactions when exposed to acids, alkalis, oxidants, or reducing agents, and are prone to discoloration. When the chemical agents remaining on the clothing material react with the teeth, slider, or opening and closing parts of the metal zipper, the zipper may discolor. This chemical reaction is more likely to occur under high temperature conditions (such as when sewn products are steam-pressed, sealed and stored in plastic bags for a long time, etc.).
Examples of color changes due to chemical reactions: Oxidizing bleach (H2O2) - black (CuO) or red (CuO2); Reducing bleach (Na2S) - black (CuS) or red (CuO); Sulfide or S, under gas excess conditions - black (CuS); Cl gas excess conditions - light yellow (CuCl); Acidic compounds and chromium compounds (Cr2O3) - blue (Cu(OH)2)
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