cobalt glass is glass containing cobalt oxide or cobaltous oxide
as a colouring agent. These oxides give the glass a blue
colouring.
View page
Cobalt has as atomic number 27 and as symbol Co. The cobalt
element is indeed used in making blue cobalt glass, among many
other byproducts and applications.
View page
cobalt can be turned into many things from magnets to jewlery to
blue glass