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  2. 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-[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. [28]

  3. How To Clean Copper For Tarnish-Free Shine - AOL

    www.aol.com/clean-copper-tarnish-free-shine...

    Cleaning Large, Free-Standing Copper Pieces Using vinegar to address larger surface areas is a cinch. For larger items that need a quick fix, fill a spray bottle with a pint of vinegar and three ...

  4. Verdigris - Wikipedia

    en.wikipedia.org/wiki/Verdigris

    The Statue of Liberty, showing advanced patination; verdigris is responsible for the statue's iconic green colour.. Verdigris (/ ˈ v ɜːr d ɪ ɡ r iː (s)/) [1] is a common name for any of a variety of somewhat toxic [2] [3] [4] copper salts of acetic acid, which range in colour from green to a bluish-green depending on their chemical composition.

  5. List of copper salts - Wikipedia

    en.wikipedia.org/wiki/List_of_copper_salts

    Copper is a chemical element with the symbol Cu (from Latin: cuprum) and the atomic number of 29. It is easily recognisable, due to its distinct red-orange color.Copper also has a range of different organic and inorganic salts, having varying oxidation states ranging from (0,I) to (III).

  6. Template:Copper compounds - Wikipedia

    en.wikipedia.org/wiki/Template:Copper_compounds

    Template: Copper compounds. ... Download QR code; Print/export Download as PDF; Printable version; In other projects Wikidata item; Appearance.

  7. Tarnish - Wikipedia

    en.wikipedia.org/wiki/Tarnish

    Unlike wear patina necessary in applications such as copper roofing, outdoor copper, bronze, and brass statues and fittings, chemical patina is considered a lot more uneven and undesirable. [2] Patina is the name given to tarnish on copper-based metals, while toning is a term for the type of tarnish which forms on coins.

  8. 25-pair color code - Wikipedia

    en.wikipedia.org/wiki/25-pair_color_code

    Older Bell System wiring inside customer premises used a cable type with four conductors of solid copper wire with the insulation colors red, green, yellow, and black (legacy) or a two-color code of blue, orange, and white.

  9. Color chart - Wikipedia

    en.wikipedia.org/wiki/Color_chart

    A color chart or color reference card is a flat, physical object that has many different color samples present. They can be available as a single-page chart, or in the form of swatchbooks or color-matching fans. Typically there are two different types of color charts: Color reference charts are intended