I have used Retayne on a red and white quilt w/red flannel backing that I was concerned about running. I have a very old Magtag wringer washer and I put the correct gallons of very hot water in, added the Retayne and mixed it in, added the quilt and let it agitate for 30 minutes. The water become a very light pink and I was scared to death but as soon as I could I took it out of the water, put it though a rinse and spin in my top loader and dried it damp dry in dryer and then air dried on a rack. Had absolutely no color running at all. THEN and only then did I began to breathe again. LOL