Charring bones for WCP

i would think so propane is a clean burning gas and there would be no more toxins going into the bones then is going into the food cooked on the grill

It is possible to burn them on a propane grill. The ideal way is to put them in some sort of column with the heat source at the bottom so they are able to completely char. When the smoke turns clear the process is complete. Remove and extinguish the Bones.