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Blue pigments were originally made from minerals such as lapis lazuli, cobalt and azurite, and blue dyes were made from plants; usually woad in Europe, and Indigofera tinctoria, or true indigo, in Asia and Africa.

Today most blue pigments and dyes are made by a chemical process. Several languages, including Japanese, Thai, Korean, and Lakota Sioux, use the same word to describe blue and green.

Blue has been an important colour in art and decoration since ancient times.

The semi-precious stone lapis lazuli was used in ancient Egypt for jewellery and ornament and later, in the Renaissance, to make the pigment ultramarine, the most expensive of all pigments.

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For example, in Vietnamese the colour of both tree leaves and the sky is xanh.

Blues with a higher frequency and thus a shorter wavelength gradually look more violet, while those with a lower frequency and a longer wavelength gradually appear more green.

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Blue is one of the three primary colours of pigments in painting and traditional colour theory, as well as in the RGB colour model.

Pure blue, in the middle, has a wavelength of 470 nanometres.

Isaac Newton included blue as one of the seven colours in his first description the visible spectrum, He chose seven colours because that was the number of notes in the musical scale, which he believed was related to the optical spectrum.

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