What is a one-sentence summary of the following article?
Many dye packages come with a soda ash solution, which helps the dye to bond with the fabric of your shirt. Dissolve the soda ash solution into a bowl of water, and let your shirt soak for around twenty minutes. If your dye did not come with soda ash, you can soak the shirt in lukewarm water. You can also choose to buy soda ash separate from your dye kit at a local craft store. Do not use cold or hot water, as they will make the dyes less effective. If you don't want the dyes to spread very far on the shirt, don't get it wet before adding the color. Dying a damp shirt helps the color to travel further, faster. So, if you want your color to be relatively isolated, dye it while it's dry.

Summary:
Soak your shirt.