Generally speaking, natural fibers such as silk and mulberry silk, as well as constituent fibers such as pure spandex, polyester, nylon, or clothes containing more than or equal to 40% spandex, nylon, polyester, etc., will not fade. Do not trust what is said in the mall, that certain clothes are made of pure cotton and will not fade, they are all misleading. Only clothes with high cotton content will fade (except for light colors), unless they are made of cotton fibers wrapped in the composition material. However, these are generally not labeled on the washing label, and they appear to be pure cotton on the surface. Also, as mentioned above, soaking in salt water may seem like a good solution, but it is only suitable for clothes with only one color, and the base does not have a color fixing effect after 5 to 10 minutes. It needs to be soaked for at least two hours.
Article source: Nylon colored yarn
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