What kind of raw material does glass form? What is the general smelting process?
Before people made of glass which has a lot of people use a lot of bubbles, there is no way to take out that European countries made out of glass without bubbles, other countries about the scary, stirring
Melt him, place the impurities in the mold, and then cool, and then the glass
It is a kind of quartz sand ore like ore, of course, a variety of quartz ore
