What color is sapphire blue?

Sapphire is blue. Sapphire is a kind of blue, pure sapphire color, bright blue, also known as sapphire. Chromatographically, it is pure blue, with pure tone and pearlescent luster, so it is a kind of pearlescent color system and belongs to cool tone. The numerical positioning of color is exactly (0,47, 167). In chemistry, the color of copper sulfate solution (CuSO4) is sapphire blue. This is a color with a strong sense of visual invasion. Since 1957, this kind of blue has enjoyed the production patent, and has a new official name, international Klein blue. His master is yves klein, a French contemporary artist.