Why not cremate the body into black charcoal, but white ashes?

The cremator is an industrial furnace, and the temperature can reach 870-980℃ (1600-1800 f), which ensures that the corpse can be disintegrated. After the cremation process is completed, the remaining process is to remove the remaining small amount of metal by magnetic field, which will be buried underground near the crematorium later. The remaining larger bone fragments will be put into a machine called "bone ash grinder" and ground into finer bone fragments, which are somewhat similar to wood ash, but with higher density. The box containing the corpse will be put into a retort furnace, and then put into a cremation fire with the temperature of 760 to1150 C (1400 to 2100 F). In the process of cremation, most corpses (especially organs) and other soft tissues will evaporate and oxidize due to the heat and gas released by the exhaust system. The whole process usually takes about two hours.

After the body is cremated, only ashes remain in the human bones. Why are the ashes white? It has been identified that the organic matter in human body will be completely burned by fire, and finally there will be incomplete burned inorganic matter, which mainly contains chemical elements such as calcium, phosphorus, oxygen and carbon. The human body contains so much, and human bones mainly contain calcium, specifically calcium carbonate. Then this substance will burn to produce another compound, which is the final pure white ash. This substance is calcium oxide.

We often say that only when we find the question can we find the final answer.