I'm working on a European mount for my boss. He found this nice buck dead, out in the woods almost completely cleaned up by critters. It had been dead for probably over a month. I boiled/simmered the skull off and on for several hours altogether with borax and dish soap. It cleaned up very well, but since it's not a fresh skull, it was very off-colored. To whiten it, I have been coating it with 35% hydrogen peroxide and sometimes (not always) even covering it with peroxide soaked paper towels, and letting it dry. I have tried this at least six times now and it just isn't turning a nice white color. Anyone have experience whitening old skulls like this? any suggestions in what different way I could really make it white (without paint, that just isn't the same)? First pic is before I was done cleaning, but you can see how off-colored it is. Second pic is after the peroxide treatments. Still quite a bit yellowed.