Lead-free crystal glasses and leaded crystal glasses can be easily distinguished from the following 4 points:

① Lead-free crystal cups have better refraction than traditional lead-containing crystal cups, and more perfectly show the refraction performance of metal glass;

(2) Look at heat resistance: lead-free crystal glass is a glass with high expansion coefficient, light and crisp, but poor resistance to extreme cold and heat;

(3) Leaded crystal glass products are slightly heavier than lead-free crystal glass products;

④ Listening to the sound: beyond the metallic sound issued by the lead crystal glass, the sound of the lead-free glass is more pleasant and beautiful, rich in the reputation of "music" cup.