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  2. Electrochemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Electrochemical_coloring...

    Electrochemical coloring of metals is a process in which the surface color of metal is changed by electrochemical techniques, i.e. cathodic or anodic polarization. The first method of electrochemical coloring of metals are certainly Nobili's colored rings, discovered by Leopoldo Nobili , an Italian physicist in 1826.

  3. Chemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Chemical_coloring_of_metals

    Chemical coloring of metals is the process of changing the color of metal surfaces with different chemical solutions. The chemical coloring of metals can be split into three types: electroplating – coating the metal surface with another metal using electrolysis. patination – chemically reacting the metal surface to form a colored oxide or ...

  4. 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 concentrations even black color.

  5. Hobo nickel - Wikipedia

    en.wikipedia.org/wiki/Hobo_nickel

    Nickel News, Fall 1987. Delma K. Romines. Hobo Nickels. Newberry Park, CA: Lonesome John Publishing Co., 1982, 106 pages. Joyce Ann Romines. Hobo Carvings: An Exclusive Upgrade of Hobo Nickel Artistry. 1996, 108 pages. Michael Wescott with Kendall Keck. The United States Nickel Five-Cent Piece: History and Date-by-Date Analysis. Wolfeboro, NH ...

  6. Color of chemicals - Wikipedia

    en.wikipedia.org/wiki/Color_of_chemicals

    This can only be used as a very rough guide, for instance if a narrow range of wavelengths within the band 647–700 nm is absorbed, then the blue and green receptors will be fully stimulated, making cyan, and the red receptor will be partially stimulated, diluting the cyan to a greyish hue.

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  9. Nickel - Wikipedia

    en.wikipedia.org/wiki/Nickel

    Nickel is preeminently an alloy metal, and its chief use is in nickel steels and nickel cast irons, in which it typically increases the tensile strength, toughness, and elastic limit. It is widely used in many other alloys, including nickel brasses and bronzes and alloys with copper, chromium, aluminium, lead, cobalt, silver, and gold ( Inconel ...

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