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Home Dyers: Fiber Reactive Dyeing for ISO 4–5 Washfast Cotton Color For home cotton fabric dyeing, fiber-reactive dye paired with a soda ash fixative gives you the most vibrant, wash-fast results of any method. Three things make or break the outcome: scour the fabric first to strip out sizing, dissolve your soda ash and dye completely before contact, and rinse in stages until the water runs clear. Skip any one of those and you get blotches, dull color, or dye that washes out in a month. TL;DR: Proper fabric preparation, including a hot scour wash, is essential to prevent patchy and uneven …