Fabric DyeCommercial dyes made for tie-dye are best. Look for one step dyes that come with applicator bottles.
Instructions
Pre-wash your fabric and leave it damp.
Mix the dye with water according to the manufacturer's instructions. One-step dyes generally just need water added to the applicator bottles.
Tie the fabric with the rubber bands. Different designs can be achieved with different tying techniques.
Put the tied fabric on a baking tray over a sink or large container that will catch the dye. Using the applicator bottles, squeeze dye in your desired areas.
Place the item in a plastic bag for 6-8 hours.
Remove from the bag and rinse in cold water until clear.
Cut the rubber bands, hang to dry.
Notes
See the full tutorial at https://blog.treasurie.com/how-to-tie-dye/