China did not pay attention to cremation in ancient times, and the monk's rule was to cremate after death, so the temperature of firewood could not reach such high heat. Some human bones and materials did not burn completely, and some crystals were formed at high temperature, which was the early relics, that is, remains. In the later history, because of the status of the relics, some people made them artificially. When the old monk was cremated, some jewels were artificially added and calcined at the same time. These jewelry materials are mixed with some human substances to crystallize, forming a variety of relics handed down from generation to generation, which is said to be the embodiment of will. This is actually bullshit. This mineral itself is not flammable, it just changes its external shape. Take the relics as bracelets. First of all, how many monks you kill is enough to string them together. Secondly, the body hangs on the hand every day (this thing is equivalent to ashes). Can you stand it? Thirdly, the relic is regarded as a treasure by Buddhists, and you play it in your hand every day. Don't you think this is blasphemy to the dead?