Nailing the coffin lid is an important step to enter the coffin after death. The previous origin is the inheritance of "three long and two short". In the past, coffins were tied with ropes, sealed with three long ropes and two short ropes, and later evolved into coffin nails. Town nails need seven nails, commonly known as "children's nails", which is said to make the son and grandson flourish. When nailing, relatives shouted "hide nails" to the deceased together, and then sprinkled five-color lines on the coffin lid, and this great coat was completed. If there are a lot of coffin nails, there are also nails that can nail the soul of the dead. The main purpose is to do a lot of evil before this life, so that it can never be super-born after it is settled. I suggest you check the coffin wood. If there is a willow tree, or even a lock board, it confirms the above point of view, because willow trees do not bear seeds, coffin nails are rarely used (the ancient nail-making technology is backward, so that "foreign nails" appear. ......