Appearance and feel can be distinguished: buy crystal glass tableware can be through sound, feel, appearance of glass, lead-containing crystal glass, lead-free crystal glass to distinguish. There are two kinds 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 refractive index of glass can be improved by adding lead into it. It looks like crystal. So it is called crystal glass. Some pendulums, crystal glasses, crystal lamps and so on are made of lead glass. In the EU standard, the crystal glasses are divided into 3 types: lead free, medium lead and high lead. Lead oxide content in medium lead glass reaches 24%, and lead oxide content in high lead glass reaches 36%. If crystal glass containers are manufactured according to European Union standards, no matter how much lead is contained in any product, there are strict international regulations, which should be safe for human body.