Question: how long do you leave bleach on when tie dyeing?
Answer: Tip: Remember that the colors will look lighter after you wash and dry the sweatshirt! For some fabrics, you may want to leave the bleach on for 15 minutes, or even up to 20 minutes. Be careful, though. If you leave the bleach mixture on for too long, the bleach can damage the fabric of your sweatshirt.