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  2. Bronze (color) - Wikipedia

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

    Bronze is a metallic brown color which resembles the metal alloy bronze. A bronze medal. The first recorded use of bronze as a color name in English was in 1753. [3]

  3. Chemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Chemical_coloring_of_metals

    Brown or black can be used as a base color for copper patina. If the amount of chlorides decreases the color will be more bluish-green, if carbonate decreases, more yellow-green. [27] Black for copper. Solution of sodium polysulfide 2.5%, items must be submerged in the solution after color developing, wash, dry and wax or varnish colored object ...

  4. List of colors by shade - Wikipedia

    en.wikipedia.org/wiki/List_of_colors_by_shade

    Brown colors are dark or muted shades of reds, oranges, and yellows. Browns are sometimes by mixing two complementary colors from the RYB model (combining all three primary colors). In theory, such combinations should produce black, but in practice (because of non-ideal pigments), they do not.

  5. Color of chemicals - Wikipedia

    en.wikipedia.org/wiki/Color_of_chemicals

    colorless, yellow or brown (hot) gray and opaque Barium: colorless: Bismuth: colorless, yellow or brownish (hot) gray and opaque Cadmium: colorless: gray and opaque Calcium: colorless: Cerium: red (hot) colorless (hot and cold) Chromium: dark yellow (hot), green (cold) green (hot and cold) Cobalt: blue (hot and cold) blue (hot and cold) Copper ...

  6. Soil color - Wikipedia

    en.wikipedia.org/wiki/Soil_color

    Dark soil color imparted by organic matter in Illinois, US. Dark brown or black colors typically indicate that the soil has a high organic matter content. [4] Organic matter coats mineral soil particles, which masks or darkens the natural mineral colors. [1] Sodium content also influences the depth of organic matter and therefore the soil color.

  7. Shades of gray - Wikipedia

    en.wikipedia.org/wiki/Shades_of_gray

    An achromatic gray is a gray color in which the red, green, and blue codes are exactly equal. The web colors gray, gainsboro, light gray, dark gray, and dim gray are all achromatic colors. A chromatic gray is a gray color in which the red, green, and blue codes are not exactly equal, but are close to each other, which is what makes it a shade ...

  8. Glass coloring and color marking - Wikipedia

    en.wikipedia.org/wiki/Glass_coloring_and_color...

    Nickel, depending on the concentration, produces blue, or violet, or even black glass. Lead crystal with added nickel acquires purplish color. Nickel together with a small amount of cobalt was used for decolorizing of lead glass. Chromium is a very powerful colorizing agent, yielding dark green [6] or in higher

  9. List of RAL colours - Wikipedia

    en.wikipedia.org/wiki/List_of_RAL_colours

    Sulfur yellow: Standard European ambulance colour in accordance with CEN 1789. [2] RAL 1017: Saffron yellow: RAL 1018: Zinc yellow: RAL 1019: Grey beige: RAL 1020: Olive yellow: RAL 1021: Colza yellow: Österreichische Post, Deutsche Bundespost 1972–1980, gold in the flag of Germany: RAL 1023: Traffic yellow: U4 line of the Berlin U-Bahn ...