How to distinguish lead crystal cups from lead-free crystal cups?
1, by hand: because crystal thermal conductivity is stronger than glass, so when you touch the crystal, you should feel cooler than touch glass.
2, look at hardness: natural crystal hardness is 7, glass hardness is 5, so crystal can cut glass.
3. Look at Refractivity: If you lift a crystal cup and rotate it against the light, you will find that it is like an exquisite handicraft, white, clear, reflecting the fascinating colorful light, because the crystal can absorb gloss, even ultraviolet light, and ordinary glassware has no gloss, no refraction.
4. Listen to the sound: tapping or finger-tapping the utensils, crystal glass can emit a light and crisp metal sound, and in the breath of a beautiful voice, and ordinary glass only a dull "click, click" sound.
Common artificial crystal cups on the market should be precisely lead glass, high lead content after improving their own refractive index and dispersion (luster).
Crystal cup characteristics
Crystal glasses emit clanging metallic sounds. Crystal glassware shines brightly and reflects colorful lights. Ordinary glassware has a low gloss, no refraction, and can't give people a clear and beautiful feeling.
Holding a crystal cup, you will feel a sense of thickness and composure.
Crystal cup technology
Crystal cup body is made of high-grade crystal glass by high-tech meticulous processing and firing, using high-temperature firing process at 640 C to reach the critical point of crystal glass melting, transparent, pure and non-toxic, and the use of annealing process to ensure that the cup body can withstand the instantaneous changes of heat and cold, explosion-proof, tailless vacuum, with penetration High brightness, strong crystal sense, wear resistance, etc., crystal clear, elegant and generous.
At the same time, double-layer glass structure, with a certain degree of cooling and heat preservation; cup mouth smoothly polished by special technology, taste comfortable when drinking; more convenient to use, more reasonable design, more user-friendly. Crystal Cup Advantages: As an important member of cup products, it has gradually shown its advantages in drinking water.