The main ingredient of glass making is silica and sometimes is utilized in the process of Persian glassblowing. In the glassblowing technical terms, glassware that is made from raw material is called yek-atisheh and those made out of recycled glasses and debris are called dou-atisheh.In the blowing process, the tip of glass blowing pipe (dam) is pressed into the melted material and after some rotation, the adhered glass (bar) is pulled out. Glassblowers use the other side of the blowpipe to blow the bar. As a result, a small sphere is made which is called gooyeh-avval.
Archeological studies and findings claim that the date and history of this Persian art back to the thirteenth century B.C. We do not know the name of old and ancient glassblowers, but we can name some contemporary masters such Khair-allah Elahi, Ali Baba Bakhtiari and Asad-allah Yousefi. Glassblowing is a traditional art mainly known and worked in Tehran. Nowadays, this art is practised and performed in Qazvin and Tabriz.