The Best Why Add Cobalt Blue Glass To Light Ideas. What do they put in cobalt glass to make it blue? That's why the glass is called blue.

Blue glass is created by adding cobalt oxide, a colorant so powerful that only a few parts per million is needed to produce a light blue color such as the shade used for certain bottled waters. History.as pigments to impart a blue colour to porcelain and glass. Hope this little bit helps!
