According to folk customs, the color of coffins is divided into five kinds: red, white, black, and gold.,Those who die horizontally or on the battlefield are put in black coffins because black belongs to the element of water, which can subdue evil spirits;,Chenpi was a few years younger than Zhuanzi, thin and timid, with no backbone. Zhuanzi led Chenpi into the pit, then spat several times into his palm. In the darkness, the two used shovels to pry open the coffin nails. It took them a lot of effort, working together before they finally managed to heave open the lid.。