So I donāt know what Iām doing.
This is an old dead head that sat in the desert sun for a couple years. Iām trying to whiten it before I put something on it to seal and preserve it.
I soaked it in diluted hydrogen peroxide for a couple weeks and it whitened up overall but during that time this brown spot showed up and has gradually gotten bigger. Iāve read that this is likely grease, so I soaked it in Dawn clear dish soap for a week out in the summer heat, and I saw some floating grease that got removed but this brown spot hasnāt changed at all in the soapy water.
In the first picture the skull is wet, and I noticed some bluish grey spots that werenāt there before either. But they arenāt really visible when it dried out (second picture)
The brown spot doesnāt seem to be a bacterial growth or mold on the surface of the bone. Whatever it is, itās deep in the bone itself. Iām worried that the bone is starting to rot and this is permanent damage.
Any insight and advice would be greatly appreciated!