7.1″ Glass Ashtray Iceberg Ashtray Crystal Glass Cigar Ashtray for Cigarettes Indoor or Outdoor Use Decoration Ornaments 6pcs

About the raw material of the Ashtray – lead-free crystal glass

• Lead-free glass is crystal glass that replaces alumina PbO with high-quality potassium carbonate K2CO3.
• High-quality potassium carbonate is purified from oak ashes, which is also called “forest glass”.
• High-quality potassium carbonate is blended into the quartz sand glass solution to make the glass out of the furnace stronger in refraction and the knocking sound more pleasing to the ear.
• Since then, potassium-containing crystal glass has surpassed lead-containing crystal glass. Now it is also used to be called lead-free crystal glass.