Originally Posted by raptureready
I don't know but if you wash them first with a couple of handfuls of salt in the water it should set the dye.
I was told by an expert that the amount of salt it would take to actually set a dye will damage a wash machine. There are better products out there that won't harm your washing machine. I didn't use anything special with the Amish black and it has never run on me, or faded. I hope this helps.