Been having issues with this bobcat skull. It previously had blood straining, after soaks in acetone and degreasing with dawn, it seemed the staining was finally gone. Recently I took it out of degreasing and noticed a slight darkening color around the bullet hole (yes it was shot, but with very little damage to the skull). I didn't think to much of it and thought maybe it would just go away. After whitening everything with peroxide to better see any remaining grease, the darkness got darker. Much much darker. What I previously thought was blood staining may actually be fragments of the bullet inside the skull and it's strained it badly. I tried a soak overnight in iron out but it helped in no way. Any ideas on how I could save this skull? :/ I'd usually have given up by now but this is one for a skeleton I'm doing and currently have no cleaned skull to replace it with. Should I just call it quits and buy a already cleaned one? I have plenty of raw frozen ones but I really don't want to clean up another one when the skeleton is so close to being done. Here's some pictures, it's still slightly wet, just took it out of the iron out a few hours ago.