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  2. Brindle - Wikipedia

    en.wikipedia.org/wiki/Brindle

    Brindle is a coat coloring pattern in animals, particularly dogs, cattle, guinea pigs, cats, and, rarely, horses. It is sometimes described as "tiger-striped", although the brindle pattern is more subtle than that of a tiger's coat. Brindle typically appears as black stripes on a red base.

  3. Superhard material - Wikipedia

    en.wikipedia.org/wiki/Superhard_material

    Rhenium was targeted as a candidate for superhard metal borides because of its desirable physical and chemical characteristics. It has a high electron density, a small atomic radius and a high bulk modulus. When combined with boron, it makes a crystal with highly covalent bonding allowing it to be incompressible and potentially very hard. [47]

  4. Coloring book - Wikipedia

    en.wikipedia.org/wiki/Coloring_book

    This is an accepted version of this page This is the latest accepted revision, reviewed on 23 February 2025. Book containing line art, to which the user is intended to add color For other uses, see Coloring Book (disambiguation). Filled-in child's coloring book, Garfield Goose (1953) A coloring book is a type of book containing line art to which people are intended to add color using crayons ...

  5. Glass coloring and color marking - Wikipedia

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

    The coloring is caused by silver nanoparticles. Selenium, like manganese, can be used in small concentrations to decolorize glass, or in higher concentrations to impart a reddish color, caused by selenium nanoparticles dispersed in glass. It is a very important agent to make pink and red glass.

  6. 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 ...

  7. Jadeite - Wikipedia

    en.wikipedia.org/wiki/Jadeite

    Jadeite is a pyroxene mineral with composition Na Al Si 2 O 6.It is hard (Mohs hardness of about 6.5 to 7.0), very tough, and dense, with a specific gravity of about 3.4.It is found in a wide range of colors, but is most often found in shades of green or white.

  8. Maze: Solve the World's Most Challenging Puzzle - Wikipedia

    en.wikipedia.org/wiki/MAZE:_Solve_the_World's...

    As Manson describes, this puzzle book "is not really a book", but "a building in the shape of a book . . . a maze", whereby "Each numbered page depicts a room in the maze". There are forty-five "rooms" (pages) in the Maze (book). In addition, "The doors in each room lead to other rooms."

  9. Heawood conjecture - Wikipedia

    en.wikipedia.org/wiki/Heawood_conjecture

    On the sphere the lower bound is easy, whereas for higher genera the upper bound is easy and was proved in Heawood's original short paper that contained the conjecture. In other words, Ringel, Youngs, and others had to construct extreme examples for every genus g = 1, 2, 3, ….

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