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Color Fastness of a Zipper refers to the stability and durability of the zipper's color during use. It mainly tests whether the color of the zipper remains intact or if it fades, transfers, or changes when exposed to various external factors such as washing, friction, light exposure, sweat, and more. Color fastness is a critical quality indicator of the zipper's appearance because it directly affects the aesthetic appeal and lifespan of the final product. The color fastness is typically graded on a scale, often from 1 to 5, where a higher grade indicates better color retention. In zipper color fastness testing, the grades range from 1 to 5, indicating the color stability from worst to best. The specific standards are as follows: Grade 1: Indicates very poor color fastness, with significant fading or staining observed during testing. The color change is highly noticeable, making it unsuitable for products where color durability is important. Grade 2: Indicates poor color fastness,
