color fastness
I recently bought a small handbook on using salt, lemons, vinegar, and baking soda. They have a recipe for color-fasting your laundry (quilt fabrics or quilts). They use 1 cup vinegar, 1/2 cup salt, and your color-safe detergent (or quilt fabric soap). Filling the washing machine with cold water, add the three ingredients and wait a few minutes to let the salt dissolve. Wash your brights with similarly colored items in small loads and the colors will be set for future washings. It says to double the amount of vinegar and salt if colors are particularly vibrant.
I haven't personally used this recipe yet so if anyone beats me to the results please share.