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  2. List of reagent testing color charts - Wikipedia

    en.wikipedia.org/wiki/List_of_reagent_testing...

    List of reagent testing color charts. It is advised to check the references for photos of reaction results. [1] Reagent testers might show the colour of the desired substance while not showing a different colour for a more dangerous additive. [2] For this reason it is essential to use multiple different tests to show all adulterants.

  3. Color blindness - Wikipedia

    en.wikipedia.org/wiki/Color_blindness

    Color blindness or color vision deficiency ( CVD) is the decreased ability to see color or differences in color. [2] The severity of color blindness ranges from mostly unnoticeable to full absence of color perception. Color blindness is usually an inherited problem or variation in the functionality of one or more of the three classes of cone ...

  4. Color - Wikipedia

    en.wikipedia.org/wiki/Color

    The theory of color includes the color complements; color balance; and classification of primary colors (traditionally red, yellow, blue), secondary colors (traditionally orange, green, purple) and tertiary colors. The study of colors in general is called color science.

  5. Aeronautical chart conventions (United States) - Wikipedia

    en.wikipedia.org/wiki/Aeronautical_chart...

    A sectional chart is a two-sided chart created from a Lambert Conformal Conic Projection [1] with two defined standard parallels. The scale is 1:500,000, with a contour interval of 500 feet. The size of each sectional is designed to be "arm's width" when completely unfolded. The "northern" half of the section is on one side of the chart, and ...

  6. Brazilian jiu-jitsu ranking system - Wikipedia

    en.wikipedia.org/wiki/Brazilian_jiu-jitsu...

    The Brazilian jiu-jitsu ranking system signifies a practitioner's increasing level of technical knowledge and practical skill within the art. Colored belts worn as part of the uniform are awarded to the practitioner. The ranking system shares its origins with the judo belt-rank system, but the Brazilian system incorporates some minor ...

  7. Traditional colors of Japan - Wikipedia

    en.wikipedia.org/wiki/Traditional_colors_of_Japan

    The traditional colors of Japan are a collection of colors traditionally used in Japanese art, literature, textiles such as kimono, and other Japanese arts and crafts. History [ edit ] The traditional colors of Japan trace their historical origins to the Twelve Level Cap and Rank System which was established in 603 by Prince Shōtoku and based ...

  8. 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: red.

  9. Azure (color) - Wikipedia

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

    On the RGB and CMYK color wheel, Azure is defined as the colour halfway between blue and cyan. The colour halfway between blue and cyan on the RGB color wheel has a hex code of 0080FF. [1] ISCC–NBS descriptor. Vivid blue. B: Normalized to [0–255] (byte) H: Normalized to [0–100] (hundred) Azure pigment.