I couldn't think of a more appropriate title-- I know people will click this and think I'm trying to bleach the orange out of the teeth or something... but no. I have this muskrat skull, great shape except for the teeth will NOT bleach out. They were macerated, black anaerobic bacteria settled on the teeth, typical rodent fare. Sat for a week in ammonia, 2-3 days in dawn just to be sure it was degreased, and then a 36 hour soak in roughly 6% H2O2. It was already pretty white when degreased fully and this just got it snow white.... except the incisors, and not for the reasons expected: I've scrubbed them, soaked the teeth for 72 hours in 6% peroxide total, and... this is as good as I've got. Should I just throw them back in a peroxide soak for a while longer? I only haven't done it because I'm worried of damaging the teeth... Honestly, I wouldn't even mind if they were solid black because it looks really cool just out of maceration in that way, but this clouded semi-orange stuff is killing me.