There are a number of these, such as cobalt oxide to produce blue shades, nitrate of silver to give a matte finish, potassium oxide, and others.
There are a number of these, such as cobalt oxide to produce blue shades, nitrate of silver to give a matte finish, potassium oxide, and others.This procedure results in more prominent colour streaks created by mineral oxides as the glass bends while it is extruded into the required shape and form.