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  2. Holmgren's wool test - Wikipedia

    en.wikipedia.org/wiki/Holmgren's_wool_test

    From the mistakes made, the doctor can diagnose the type of colour blindness. [7] If the patient chooses blue or violet colors in the red matching test, it means that they have red blindness. [8] If the patient choose gray or dark brown colors on the green color matching, it indicates that they may have a green blindness problem. [8]

  3. Violet (color) - Wikipedia

    en.wikipedia.org/wiki/Violet_(color)

    In optics, violet is a spectral color: It refers to the color of any different single wavelength of light on the short wavelength end of the visible spectrum (between approximately 380 and 435 nanometers), [16] [17] whereas purple is the color of various combinations of red, blue and violet light, [5] [6] some of which some humans perceive as ...

  4. Metamerism (color) - Wikipedia

    en.wikipedia.org/wiki/Metamerism_(color)

    Color matching in the textile dyeing industry is essential. In this branch, three types of metamerism are commonly encountered: illuminant metamerism, observer metamerism and field-size metamerism. [citation needed] Due to the wide range of different illuminants in modern life, textile color matching is difficult to ensure. Metamerism on large ...

  5. Shades of purple - Wikipedia

    en.wikipedia.org/wiki/Shades_of_purple

    The equivalent color on a computer to the pigment color red-violet shown above would be this electric purple, i.e. the much brighter purple reproduced on the screen of a computer. This color is pure purple conceived as computer artists conceive it, as the color on the color wheel halfway between color wheel violet and electric magenta. Thus ...

  6. Pantone - Wikipedia

    en.wikipedia.org/wiki/Pantone

    Pantone LLC (stylized as PANTONE) is an American limited liability company headquartered in Carlstadt, New Jersey, [1] and best known for its Pantone Matching System (PMS), a proprietary color order system used in a variety of industries, notably graphic design, fashion design, product design, printing, and manufacturing and supporting the management of color from design to production, in ...

  7. List of electronic color code mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_electronic_color...

    A mnemonic which includes color name(s) generally reduces the chances of confusing black and brown. Some mnemonics that are easy to remember: Big Boys Race Our Young Girls But Violet Generally Wins.