Float over. Cattle leaves that grow up on feed are black, and those that grow up on grain are yellow. White hairy belly is generally bleached with hydrogen peroxide, and venetian blinds used in teahouses, stalls and hot pot restaurants will be bleached more or less. If high-purity hydrogen peroxide (H2O2) is used for bleaching, it will not do much harm to human body after repeated washing, but if industrial hydrogen peroxide is used, there will generally be heavy metal residues.

Tripe is tripe. Alias: louver, belly tip, tripe. It is one of the internal organs of cattle, that is, the third diaphragm stomach in the stomach of cattle. The valve stomach is leaflike, and its function is to absorb water and acid produced by fermentation. Niubaiye can be used as food, generally used for hot pot, fried food and other purposes. Cantonese people also steam tea as a snack when they drink it. Fresh tripe must be crispy and delicious. Tripe contains protein, fat, calcium, phosphorus, iron, thiamine, riboflavin, nicotinic acid and so on.