blue

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 * Blue** is the color between violet and green on the optical spectrum of visible light.

Wikipedia
[|Blue]

Translating: Blue
German: Blau Spanish: Azul Maori: Kahurangi - blue. The cloak (kahu) of the heavens (rangi). media type="custom" key="29220889"

A **cyanometer** is an instrument for measuring the blueness of the sky.

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http://qz.com/727211/chemists-accidentally-created-this-beautiful-new-color-in-a-lab-experiment http://www.abc.net.au/news/2017-07-21/prussian-blue-hokusai-great-wave-how-a-pigment-changed-the-world/8731732

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