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  2. Purple - Wikipedia

    en.wikipedia.org/wiki/Purple

    The standard HTML color purple is created by red and blue light of equal intensity, at a brightness that is halfway between full power and darkness. In color printing, purple is sometimes represented by the color magenta, or sometimes by mixing magenta with red or blue. It can also be created by mixing just red and blue alone, but in that case ...

  3. Shades of red - Wikipedia

    en.wikipedia.org/wiki/Shades_of_red

    In order for all the colors to be spaced uniformly, it was found necessary to use a color wheel with five primary colorsred, yellow, green, blue, and purple. The Munsell colors displayed are only approximate as they have been adjusted to fit into the sRGB gamut .

  4. Tyrian purple - Wikipedia

    en.wikipedia.org/wiki/Tyrian_purple

    Variations in colours of "Tyrian purple" from different snails are related to the presence of indigo dye (blue), 6-bromoindigo (purple), and the red 6,6'-dibromoindigo. Additional changes in colour can be induced by debromination from light exposure (as is the case for Tekhelet ) or by heat processing. [ 36 ]

  5. Color blindness - Wikipedia

    en.wikipedia.org/wiki/Color_blindness

    Both forms are almost always symptomatic of congenital red–green color blindness, so affects males disproportionately more than females. [37] This form of color blindness is sometimes referred to as daltonism after John Dalton, who had red–green dichromacy. In some languages, daltonism is still used to describe red–green color blindness.

  6. Cochineal - Wikipedia

    en.wikipedia.org/wiki/Cochineal

    In 1454, Pope Paul II officially changed the color of the robes worn by Catholic cardinals from "Cardinal's purple" to vibrant red. By 1558, their red robes would have been created with American cochineal. [24]: 45 By the 1600s, cochineal also gave the English "Redcoats" their distinctive officers' uniforms.

  7. Secondary color - Wikipedia

    en.wikipedia.org/wiki/Secondary_color

    A RYB color wheel with tertiary colors described under the modern definition. RYB is a subtractive mixing color model, used to estimate the mixing of pigments (e.g. paint) in traditional color theory, with primary colors red, yellow, and blue. The secondary colors are green, purple, and orange as demonstrated here:

  8. Red - Wikipedia

    en.wikipedia.org/wiki/Red

    Red is the color at the long wavelength end of the visible spectrum of light, ... and are usually colored purple, a mix of red and blue. [107] ...

  9. Visible spectrum - Wikipedia

    en.wikipedia.org/wiki/Visible_spectrum

    The spectral colors from red to violet are divided by the notes of the musical scale, starting at D. The circle completes a full octave, from D to D. Newton's circle places red, at one end of the spectrum, next to violet, at the other. This reflects the fact that non-spectral purple colors are observed when red and violet light are mixed.

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