This practice has been lost. There used to be a saying that raw rhinos dare not burn, but they have a strange smell when burned, and people can communicate with ghosts. It was recorded in the ancient Book of Jin, but it was forbidden in the State of Jin at that time. At that time, rhinoceros incense was forbidden, and those monks and disciples knew it, but they wouldn't touch rhinoceros horns. This is also a ban.
Up to now, no one knows the fragrance of rhinoceros.