Look at the pot first: Osaka, Nishimsaka and Satsuma have a good reputation for tin ware. Simple tin detector: 0. After touching the tin pot, there was obviously a black mark on the hand, which contained heavy lead. 1. Wipe the inner wall of the tin can with cotton cloth and observe the color. Light yellow indicates that the tin content is 99.9%. 2. See if there are obvious welding marks on the low contact surface between the pot body and the pot. 3. At present, there is no uniform standard for tin content in tin containers in the world, and the quality is usually determined by enterprises themselves. During tin can processing, most factories add other metals according to the processing technology. Unless the lead content is heavy, special institutions and equipment are needed to detect the lead content.