The blue light region of blue glass filter is located in the wavelength range of 440 -- 500nm. Pure blue corresponds to wavelengths of 470nm. Shorter wavelengths have a purplish-blue tinge, while longer wavelengths change their color to a light greenish-blue. The colorants commonly used to make blue glass are compounds of cobalt and copper, which are ancient colorants in glass smelting and can be used to accurately reproduce valuable gems. For example: lilac or pure blue sapphire, light green blue aquamarine) appearance, its hue is similar to the color of sea water.

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