Hi this is a documentary video about the process of making glass. they use natural ingredients for making glass like silica sand which contain 45 % of the ingredients for making bottle glass then they use soda ash will make the ingredients to melt evenly and the other main ingredient is limestone. They will be melts in the furnace at the heat of 2730 Fahrenheit. The consistency of the melted ingredients is like honey. The pour it to the machine and make cylindrical shape of them. Then they put in the mold. Which shape melted glass that will make the final glass bottle.