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  2. Obsidian - Wikipedia

    en.wikipedia.org/wiki/Obsidian

    In some stones, the inclusion of small, white, radially clustered crystals (spherulites) of the mineral cristobalite in the black glass produce a blotchy or snowflake pattern (snowflake obsidian). Obsidian may contain patterns of gas bubbles remaining from the lava flow, aligned along layers created as the molten rock was flowing before being ...

  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. Spray paint - Wikipedia

    en.wikipedia.org/wiki/Spray_paint

    Spray paint (formally aerosol paint) is paint that comes in a sealed, pressurized container and is released in an aerosol spray when a valve button is depressed. The propellant is what the container of pressurized gas is called. When the pressure holding the gas is released through the valve, the aerosol paint releases as a fine spray. [1]

  5. Metallic color - Wikipedia

    en.wikipedia.org/wiki/Metallic_color

    However, the metallic finish of such paints was added using fine aluminum powder and pigment rather than actual gold. The use of metallic colors is not limited to those colors that approximate the appearance of actual metals. In some instances, it has been noted, "beetles with bright metallic colors are made up into tie pins and cuff links". [1 ...

  6. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    An opal doublet consists of a relatively thin layer of precious opal, backed by a layer of dark-colored material, most commonly ironstone, dark or black common opal (potch), onyx, or obsidian. The darker backing emphasizes the play of color and results in a more attractive display than a lighter potch.

  7. Metallic paint - Wikipedia

    en.wikipedia.org/wiki/Metallic_paint

    Metallic paint, which may also be called metal flake (or incorrectly named polychromatic), is a type of paint that is most common on new automobiles, but is also used for other purposes. Metallic paint can reveal the contours of bodywork more than non-metallic, or "solid" paint. Close-up, the small metal flakes included in the paint create a ...

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