Place your colored sheets into your bathtub and close the drain. The sheets must be composed of a natural fiber. Sheets made of materials such as cotton or linen are particularly suited for this application.
Fill the tub with three parts water and one part bleach. It is important that you adhere to this ratio. If the bleach is not diluted, it can eat through the fabric of your sheets.
Gently stir the sheets and bleach solution with a wooden pole and then let rest for 30 minutes.
Remove your sheets from the bathtub and wring them out. After you wring them out, deposit them into your washing machine and set to a gentle wash cycle with warm water.
Remove the sheets from your washer and dry them. If you are not satisfied with the color, repeat the bleaching and washing cycle again.