Higher mesh count fabric color is dyed so that when you're exposing a high mesh count screen, the light will not scatter as much as it would with white fabric, this factor having some importance when exposing critical images including halftones. Why there are so many colors to choose from is a mystery, but gold seems to be most common “colored” mesh available from most screen printing supply vendors.
A general rule used in many apparel screen printing shops is to order gold colored mesh for all mesh counts of 200 and up.
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