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  2. 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.

  3. List of awareness ribbons - Wikipedia

    en.wikipedia.org/wiki/List_of_awareness_ribbons

    This is a partial list of awareness ribbons.The meaning behind an awareness ribbon depends on its colors and pattern. Since many advocacy groups have adopted ribbons as symbols of support or awareness, ribbons, particularly those of a single color, some colors may refer to more than one cause.

  4. 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.

  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 of chemicals - Wikipedia

    en.wikipedia.org/wiki/Color_of_chemicals

    The color of chemicals is a physical property of chemicals that in most cases comes from the excitation of electrons due to an absorption of energy ... dark purple ...

  7. 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.

  8. 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 ...

  9. 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).

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