Don't know if it's the same type thing, but someone gave me a piece of gorgeous red wool flannel. I prewashed it in Woolite and cold water and am very happy I did so. The dye ran like crazy. I mean the water looked like the juice from a can of beets. I washed it several times, like 4 or 5 with the same results. It was less than a yard and I finally pitched it. I was afraid to use it for anything for fear the item would get damp and the dye would rub off. Can you cut a small sliver & try woolite? If it works on the sample, I would hand launder the whole piece with woolite.