Lead-free crystal wine glass. Crystal glass glasses are not made of natural crystal, but special ingredients are added to the raw materials of the glass to greatly enhance the refractive index, hardness, brightness and transparency of the glass, so that the glass made is crystal clear, hence the name.

The more common crystal cups are divided into lead crystal cups and lead-free crystal cups. There is little difference in appearance between the two types of cups. The main difference lies in the additives used in the glass. As the name suggests, lead crystal cups are made of glass with lead oxide added to it. The proportion of lead oxide added varies from country to country. Generally speaking, the proportion of lead oxide is more than 24% before the glass will show its remarkable beauty.