When/when not to use color preserver on thread?

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Fuji Ultra Poly Thread

Nylon Rod Wrapping Thread made from 100% nylon (Color Preserver required to keep its original color without fading) - Consistent tension makes

Hitena Thread - Nylon (100 yd spool)

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Fuji Ultra Poly Thread

Fuji Thread NEW COLORS 2023! Ultra Poly 100 Meter - HFF

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ProWrap ColorFast Thread Size D – Purples, Pinks, Reds

Color preserver question Rod Building and Tackle Tinkering

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Fuji Ultra Poly Thread