1. Look at the signs: Lead-free glass generally contains potassium, mostly high-end crafts and has a logo on the outer packaging; leaded glass contains lead, which is a crystal glass utensil commonly found in some supermarkets and stalls. The content can reach 24%.
2. Look at the color: lead-free glass has better refractive index than traditional leaded crystal glass, and it more perfectly shows the refractive performance of metal glass; such as various shapes of ornaments, crystal wine glasses, crystal lights, etc. Made of leaded glass.
3. Look at the heat resistance: The glass can generally withstand high temperatures, but generally has poor resistance to extreme cold and heat. Lead-free crystal glass is a glass with a high coefficient of expansion, which is more resistant to extreme cold and heat. If you use boiling water in a particularly cold lead-free glass, it will easily burst.
4. Light and heavy: Compared with lead-free crystal glass products, lead-containing crystal glass products should be slightly thicker.
5. Listen to the sound: Beyond the metallic sound of the leaded crystal glass, the sound of the lead-free glass is more pleasing to the ear and has a good reputation as a "music" cup.
6. Look at toughness: Lead-free glass is more tough than leaded crystal glass, that is, impact resistance.