Also, there are several previous posts on this topic you might want to read. In some of them Prism99 mentions Synthropol requires hot water to be fully effective and lots of water as it keeps the dye suspended in the water. Some say they use it and color catchers. If you do get some bleeding, do Not put it in the dryer as that may set the bleeding dyes. Instead wash it again with Synthropol, color catchers or both as the bleeding dye can still be washed out at this point. I only wanted to wash on cold water and just used color catchers and luckily didn't have bleeders.