Crematorium cremates the whole body. What can't be burned?

Crematorium cremates the whole body, and the gold ornaments on the body can't be burned, such as gold rings and teeth. True blue will never stain. As for the remains themselves, they will all burn out, not only can they burn out, but they must also burn out, and the remains must all be burned to ashes. This is a national regulation and a responsibility that crematoriums must perform. What you said can't be burned should be stones. Some stones are as hard as stones and won't burn. But stones are generally small and can be ignored when mixed with a pile of ashes.