I found that it is not all the dark colors that bleed. I have had pale blues, yellows, as well as some patterned fabrics have bled. So now I wash every thing in HOT soapy water. Yes hot---if it is going to bleed it will then. Not every one washes in cool water and by doing it in hot I can make sure that once in a quilt I will not have any problems once made up. I add vinegar and salt to the water and let it cool that way it sets the dye. I starch and iron it before putting it away. I usually store unwashed in a container until I have enough fabric to wash.