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Blue is the colour of light between violet and green on the visible spectrum.Hues of blue include indigo and ultramarine, closer to violet; pure blue, without any mixture of other colours; Cyan, which is midway in the spectrum between blue and green, and the other bluegreens turquoise, teal, and aquamarine.. Blue also varies in shade or tint; darker shades of blue contain black or grey, while ...
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