Cobalt oxide (CoO) is commonly added to the glass melt as a pigment. The exact shade of purple may vary depending on the concentration of cobalt used. This purple color has a functional purpose rather than decorative purposes.
Why cobalt oxide?
The primary reason for incorporating cobalt oxide is to provide stability and thermal resistance to the glass lining. It improves the glass's mechanical strength, making it less susceptible to breakage due to thermal shock or sudden temperature fluctuations. It increases the glass's melting point, enhancing its reliability and performance under demanding temperature conditions.
