Cobalt blue is the product of mixed oxide of cobalt and aluminum and has a color makeup of zero percent red, 28 percent green and 67 percent blue.
The hexadecimal triplet value for cobalt blue is 0047AB. Cobalt blue is a slightly lighter and less intense color than Prussian Blue. Cobalt blue is one of the most popular shades of blue and has been widely used since the early 1800s. The cobalt blue pigment is commonly used in jewelry, glassware, paintings and concrete. It is a highly stable compound and can be used in high heat, light and acidic environments.