Can I use Rit dye, without rinsing, to color a huge amount of polyester/spandex fabric?

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FanFlex: Lightweight flexible crests and patches that fold easy. - FanTex: An all-new super comfortable soft fabric. - FanFit: The authentic on-ice

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Can I dye cotton using Rit DyeMore Synthetic? Let me tell you.. it wasn't easy finding these two colors. Lol : r/dyeing

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