So I wanted to tie some crabs in a little lighter color, maybe tan or cream olive. The only fly shop within a half hour has no light sculpin wool, so a friend suggested I try bleach. So I put a half capfull in a cup or so of water and let a little chunk of sculpin wool soak for about an hour. The result was a bleached dark olive, not acceptable. I think, "more bleach, more time". Or maybe not.
The fibers on the little piece used to be as long as on the big piece. Bleach changed all that. And it was just liquid remaining. Don't fuck with bleach.