This is called "lemon". A tree of hyacinthus orientalis family. Some trees are like orange trees, and some branches have big thorns. After being cut down, it will turn red after several times of burning, peeling, grinding and oiling, which is the kind of stick you see in Qingyan. In fact, many scenic spots in Guiyang are sold at the door, ranging from tens of yuan to several thousand yuan according to the shape and thickness of patina. It is impossible to sell it on Taobao.