I have been dying and Bleaching fly tying materials for about 40 years and that is just the way it is. Remember you can get away with a lot more when dying and bleaching with hair than you can with feathers. Feathers will not take as much before you ruin them. Been there done that. Most feathers will not come out white after bleaching if they are a different color to start with. They just can't take that much bleach before you ruin them. Good Luck. Ron