Appearance can be distinguished: Buy crystal glass tableware can distinguish between glass, lead crystal glass and lead-free crystal glass by sound, feel and appearance. There are two types of crystal glass containers: lead-free crystal glass and lead crystal glass. Because the color, texture and gloss of ordinary glass are not ideal. The addition of lead to the glass can increase the refractive index of the glass. It looks like crystal, so it is called crystal glass. Some kinds of ornaments, crystal glasses, crystal lamps, etc. are made of leaded glass. Made of. The crystal glass is divided into three types: lead-free, medium-lead and high-lead. Lead lead glass has a lead oxide content of 24%; high lead glass has a lead oxide content of 36%. If the crystal glass container is produced in accordance with EU standards, no matter which kind of product, there is a lot of lead in the world, there are strict regulations in the world, and it should be safe for the human body. However, due to the lack of standards in China, it is impossible to rule out the arbitrariness of individual manufacturers and the difficulty in ensuring product quality.