Sapphire is pure blue in color spectrum, with pure tone and pearlescent luster, so it is a kind of pearlescent color system and belongs to cool tone.
The accurate numerical positioning of color is (0,47, 167), and the color of copper sulfate solution (CuSO4) in chemistry is sapphire blue.
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Other blue:
1, malachite blue, named after the glaze color of porcelain, malachite blue porcelain is a low-temperature glaze with bright blue tone after firing with copper as colorant. It symbolizes a strange rebirth. It will exist in a special way, giving people a hint and a mysterious power in their hearts.
2. Lake blue is a dark blue similar to sapphire. The color between blue and green can make people feel relaxed and comfortable. By extension, lake blue, like the blue of lake water, is a beautiful and quiet color, giving people unlimited reverie.