Have friends ever had such an experience? When you go to the market or shopping mall to buy leather goods, ask the boss or the clerk whether the leather goods you want to buy are genuine leather. Most of the answers you get must be certain, it is leather, and it is very positive. But this is not necessarily the real answer you get, because at the merchants, they define the leather as: real natural cowhide, sheepskin, fish skin is leather, real artificial leather (PU, PVC) is also leather. The dermis is also synthesized after crushing the beef and sheep skin. So when you go to buy leather goods, you must ask: Is it natural or synthetic?