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  2. List of reagent testing color charts - Wikipedia

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

    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]

  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. Help:Using colours - Wikipedia

    en.wikipedia.org/wiki/Help:Using_colours

    To use a colour in a template or table you can use the hex triplet (e.g. #CD7F32 is bronze) or HTML color name (e.g. red).. Editors are encouraged to make use of tools, such as Color Brewer 2 to create Brewer palettes, listed at MOS:COLOR for color scheme selection used in graphical charts, maps, tables, and webpages with accessibility in mind for color-blind and visually impaired users.

  5. Marking blue - Wikipedia

    en.wikipedia.org/wiki/Marking_blue

    Marking out a metal bar. Marking blue or layout stain (sometimes called Dykem after trademark erosion of a popular brand, or Prussian blue after the blue pigment) is a dye used in metalworking to aid in marking out rough parts for further machining.

  6. Mollusc shell - Wikipedia

    en.wikipedia.org/wiki/Mollusc_shell

    This is what accounts for the striking colors and patterns that can be seen in some species of seashells, and the shells of some tropical land snails. These shell pigments sometimes include compounds such as pyrroles and porphyrins. Shells are almost always composed of polymorphs of calcium carbonate - either calcite or aragonite. In many cases ...

  7. Wood stain - Wikipedia

    en.wikipedia.org/wiki/Wood_stain

    Wood stain is a type of paint used to colour wood.It consists of colourants dissolved and/or suspended in a vehicle or solvent.Vehicle is the preferred term, as the contents of a stain may not be truly dissolved in the vehicle, but rather suspended, and thus the vehicle may not be a true solvent.

  8. Windowpane oyster - Wikipedia

    en.wikipedia.org/wiki/Windowpane_oyster

    The nearly flat shells of the capiz can grow to over 150 mm (5.9 in) in diameter, reaching maturity between 70 and 100 mm (2.8 and 3.9 in). The shell is secured by a V-shaped ligament . Males and females are distinguished by the color of the gonads .

  9. Seashell (color) - Wikipedia

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

    Seashell is an off-white color that resembles some of the very pale pinkish tones that are common in many seashells. The first recorded use of seashell as a color name in English was in 1926. [1] In 1987, "seashell" was included as one of the X11 colors. Cockle on the Shell Beach, Western Australia