Glass is divided into ordinary glass and crystal glass, and crystal glass is divided into two kinds: lead-free crystal glass and lead-containing crystal glass. How can we identify lead-free glasses? The method is actually very simple. We can distinguish lead-containing glass from lead-free glass by looking at weight, logo, color and heat resistance. How to Identify Lead-free Glasses 1. Look at the logo: Lead-free glasses generally contain potassium and are mostly high-grade handicrafts with a logo on the outer package. While lead-containing glasses contain lead, i.e. crystal glassware commonly found in supermarkets and stalls, the content of lead oxide can reach 24%. 2. Look at the color and luster: Lead-free glass has better refractive power than traditional lead-containing crystal glass, which shows the refractive power of metal glass more perfectly. For example, some ornaments of various shapes, crystal glasses, crystal lamps, etc. are made of lead-containing glass. 3. Look at heat resistance: glasses can generally withstand very high temperatures, but generally have poor resistance to extreme cold and heat. Lead-free crystal glass is a glass with high expansion coefficient, and its resistance to extreme cold and heat is even worse. If boiling water is used to make tea in a particularly cold lead-free glass, it is easy to burst. 4. Weighing in Weight: Compared with lead-free crystal glass products, lead-free crystal glass products are slightly thicker. 5. Listening to Sound: Beyond the metal sound emitted by lead-containing crystal glasses, the sound of lead-free glasses is more pleasing to the ear and is reputed as a "music" cup. 6. Toughness: Lead-free glasses are more tough than lead-containing crystal glasses, i.e. impact resistant. The national standard for lead-free crystal glass has not yet been formulated. At present, our country does not have a national standard for crystal glass, so many enterprises are manufacturing according to European Union standards. According to EU standards, crystal glasses are classified into three types: lead-free, lead-free and high-lead. The content of lead oxide in lead glasses reaches 24%. The content of lead oxide in high-lead glasses reaches 36%. If crystal glass containers are produced in accordance with EU standards, no matter what kind of products, how much lead they contain, there are strict international regulations and they should be safe for human beings. However, due to the lack of standards in our country, it is impossible to rule out the situation that individual manufacturers have large randomness in production and the quality of products is difficult to guarantee. Therefore, it is suggested that when you use lead-containing glassware in your daily life, try to avoid holding acidic drinks or food, and it is better to use ordinary glasses. Conditions permit, lead-free crystal glass is used as wine glasses and kitchen utensils, which is safer and more reliable.