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  2. Color temperature - Wikipedia

    en.wikipedia.org/wiki/Color_temperature

    Although the concept of correlated color temperature extends the definition to any visible light, the color temperature of a green or a purple light rarely is useful information. Color temperature is conventionally expressed in kelvins, using the symbol K, a unit for absolute temperature.

  3. Handkerchief code - Wikipedia

    en.wikipedia.org/wiki/Handkerchief_code

    For example, a dark blue handkerchief indicates an interest in anal sex, and wearing it in the left pocket indicates a preference for being the penetrating partner. The code was first used in the 1970s in the United States, Canada, Australia, and Europe, by gay and bisexual men seeking casual sex or BDSM practitioners.

  4. Munsell color system - Wikipedia

    en.wikipedia.org/wiki/Munsell_color_system

    The Munsell color system, showing: a circle of hues at value 5 chroma 6; the neutral values from 0 to 10; and the chromas of purple-blue (5PB) at value 5. In colorimetry, the Munsell color system is a color space that specifies colors based on three properties of color: hue (basic color), value , and chroma (color intensity

  5. Marquis reagent - Wikipedia

    en.wikipedia.org/wiki/Marquis_reagent

    Color Time (s) Notes MDMA or MDA: purple to black 0–5: May have dark purple tint Amphetamine, or methamphetamine: orange to brown 0–5: May have a brown tint 2C-B: yellow to green 5–10: Color may change from initial result [7] DXM: gray to black 15–30: Initially no change; takes much longer to reach black than MDMA

  6. Color terminology for race - Wikipedia

    en.wikipedia.org/wiki/Color_terminology_for_race

    Categorization of racial groups by reference to skin color is common in classical antiquity. [7] For example, it is found in e.g. Physiognomica, a Greek treatise dated to c. 300 BC. The transmission of the "color terminology" for race from antiquity to early anthropology in 17th century Europe took place via rabbinical literature.

  7. Colors of noise - Wikipedia

    en.wikipedia.org/wiki/Colors_of_noise

    White noise spectrum. Flat power spectrum. (logarithmic frequency axis) White noise is a signal (or process), named by analogy to white light, with a flat frequency spectrum when plotted as a linear function of frequency (e.g., in Hz).

  8. Color wheel - Wikipedia

    en.wikipedia.org/wiki/Color_wheel

    Gradient RGB/CMY color wheel Seven-color and twelve-color color circles from 1708, attributed to Claude Boutet Wilhelm von Bezold's 1874 Farbentafel. A color wheel or color circle [1] is an abstract illustrative organization of color hues around a circle, which shows the relationships between primary colors, secondary colors, tertiary colors etc.

  9. Plum (color) - Wikipedia

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

    Plum is a purple color with a brownish-gray tinge, like that shown on the right, or a reddish purple, which is a close representation of the average color of the plum fruit. As a quaternary color on the RYB color wheel, plum is an equal mix of the tertiary colors russet and slate. [2] [3] The first recorded use of plum as a color name in ...

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