Bleach doesn’t “set” color—it murders it. It breaks the dye molecules into sad little pancakes. If you want to go from black to white, you need color remover, which is like bleach’s polite cousin.
And never, ever mix bleach with ammonia. That makes chlorine gas, which will turn your craft day into a visit from the hazmat team. Not a good look.
Final Playful Word of Caution
Dyeing fabric is 50% science, 40% patience, and 10% praying to the laundry gods. Your first attempt might look like a mutant watermelon. That’s okay. Call it “abstract expressionism” and hang it on the wall.
Now go forth and color something. Your wardrobe has been beige long enough.