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  2. 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 salt.

  3. Glass coloring and color marking - Wikipedia

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

    Glass coloring and color marking may be obtained in several ways. by the addition of coloring ions, [ 1][ 2] by precipitation of nanometer-sized colloids (so-called striking glasses[ 1] such as "gold ruby" [ 3] or red "selenium ruby"), [ 2] Ancient Roman enamelled glass, 1st century, Begram Hoard. by colored inclusions (as in milk glass and ...

  4. HP calculators - Wikipedia

    en.wikipedia.org/wiki/HP_calculators

    HP calculators. HP calculators are various calculators manufactured by the Hewlett-Packard company over the years. Their desktop models included the HP 9800 series, while their handheld models started with the HP-35. Their focus has been on high-end scientific, engineering and complex financial uses.

  5. Domain coloring - Wikipedia

    en.wikipedia.org/wiki/Domain_coloring

    Domain coloring plot of the function f(x) = ⁠ ( x2 − 1) ( x − 2 − i) 2 x2 + 2 + 2 i⁠, using the structured color function described below. In complex analysis, domain coloring or a color wheel graph is a technique for visualizing complex functions by assigning a color to each point of the complex plane. By assigning points on the ...

  6. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    A modern scientific calculator with an LCD. An electronic calculator is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics . The first solid-state electronic calculator was created in the early 1960s. Pocket-sized devices became available in the 1970s, especially after the ...

  7. Copper - Wikipedia

    en.wikipedia.org/wiki/Copper

    Copper alloys are widely used in the production of coinage; seen here are two examples – post-1964 American dimes, which are composed of the alloy cupronickel [50] and a pre-1968 Canadian dime, which is composed of an alloy of 80 percent silver and 20 percent copper. [51

  8. CPK coloring - Wikipedia

    en.wikipedia.org/wiki/CPK_coloring

    CPK coloring. A plastic ball-and-stick model of proline. These models usually comply with CPK coloring. In chemistry, the CPK coloring (for Corey – Pauling – Koltun) is a popular color convention for distinguishing atoms of different chemical elements in molecular models.

  9. Coloring book - Wikipedia

    en.wikipedia.org/wiki/Coloring_book

    A coloring book (British English: colouring-in book, colouring book, or colouring page) is a type of book containing line art to which people are intended to add color using crayons, colored pencils, marker pens, paint or other artistic media. Traditional coloring books and coloring pages are printed on paper or card.

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