Originally Posted by Qwiltylady
White Vinegar in the washer (1 cup) will eliminate all excess dye and prevent it from settling into other fabrics! I buy it by the gallon and then use it when I prewash my fabrics and nothing runs!
Please note that vinegar will work to prevent bleeding only on dyes that are of an Acid type. Acid type dyes are not used on commerically dyed cottons. Most of the benefits from using vinegar are in removing any finishes such as starch or commercial sizings. The prewashing is what is having any effect on dispursing some excess dyes, and not actually setting the dye. If all of the excess is not removed in prewashing , vinegar is not setting the dye, since if it is a cotton and acid dye was not used. There is much mis-information on this subject. Acid dyes are used on wool.