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Indigo (closest in Gamut )textcolor=white
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4B0082
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75g= 0b=130
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42m=100y= 0k= 49
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275s=100v= 51
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is the color of Light between 440 to 420 Nanometre s in Wavelength , placing it between Blue and Violet . Light that contains both Violet and Blue frequencies is also indigo, but this is not how indigo is defined. Like many other colors ( Orange and Violet are the most well-known), it gets its name from an object in the natural world - the plant named '' Indigo '' once used for dyeing cloth (see also Indigo Dye ).
Indigo is neither an additive Primary Color nor a subtractive primary color. It was named and defined by Isaac Newton when he divided up the Optical Spectrum (which is a continuum of frequencies). He named Seven colors specifically to link them with the (known) Planet s, Day s of the Week , and other lists that had seven items.
The Human Eye is relatively insensitive to indigo's frequencies, and some otherwise well-sighted people cannot distinguish indigo from blue and violet. For this reason some commentators including Isaac Asimov have suggested that indigo should not be regarded as a color in its own right but merely as a shade of blue or violet.
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