Rit Synthetic Dye Black

Rit DyeMore Advanced Liquid Dye for Synthetics 7-Ounce Graphite

6 Rit Dyemore Assortment Kit - Pick Your Own Colors

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Rit Black All Purpose Dye, 1-1/8 oz

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Rit DyeMore Liquid Synthetic Fiber Dye - Apricot Orange

So I'm trying to dye these black, but it's not taking the synthetic dye very well. I use the RIT graphite and navy one. They're a polyester material, and I used the

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