exposed in the permafrost of Siberia. The abundance of mammoth ivory, and the fact that the trade is legal, has dealt a hard blow against the illegal ivory trade. Mammoth ivory can be found in more than the normal white/yellowish colors normal ivory has. This is because minerals in the ground sometimes color the ivory. Unless it is properly cared for, mammoth ivory is prone to cracking caused by changes in temperature and moisture levels. Bone, horn, ivory and such should not be autoclaved, as it will destroy them. They are also unsuitable for unhealed piercings or for wear while stretching existing ones. See also Body piercing Body piercing jewellery Earring Glass Autoclave Titanium Gold Silver Niobium Bronze Sources Organic LLC: Information on care of natural materials, endangered wood species, possible allergic reactions to wood species, and more References Materials de:Piercingschmuck