The Enameler introduces colour both by using coloured glass or by including pigments for the glass prior to firing. Following the glass melts and flows, it cools into a really hard, sleek coating about the substrate. and kinda amazing. Including quality functions like Tricky Solar, Bluetooth and Multiband 6, this https://www.watchesworld.com/exploring-the-aesthetics-of-dial-design-and-decoration/