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  2. Topaz - Wikipedia

    en.wikipedia.org/wiki/Topaz

    Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula Al 2 Si O 4 (F, OH) 2.It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. [7]

  3. Interference colour chart - Wikipedia

    en.wikipedia.org/wiki/Interference_colour_chart

    When using the chart, it is important to remember these tips: Isotropic and opaque (metallic) minerals cannot be identified this way. The stage of the microscope should be rotated until maximum colour is found, and therefore, the maximum birefringence. Each mineral, depending on the orientation, may not exhibit the maximum birefringence.

  4. List of reagent testing color charts - Wikipedia

    en.wikipedia.org/wiki/List_of_reagent_testing...

    It is advised to check the references for photos of reaction results. [1] Reagent testers might show the colour of the desired substance while not showing a different colour for a more dangerous additive. [2]

  5. Gemstone irradiation - Wikipedia

    en.wikipedia.org/wiki/Gemstone_irradiation

    Swiss Blue, subtly lighter than the US variety, is the result of a combination of the two methods. [26] Diamonds are mainly irradiated to become blue-green or green, although other colors are possible. [29] When light-to-medium-yellow diamonds are treated with gamma rays they may become green; with a high-energy electron beam, blue. [23]

  6. List of international auto racing colours - Wikipedia

    en.wikipedia.org/wiki/List_of_international_auto...

    Thailand's accepted racing colours of mid blue with a lower yellow band and/or yellow wheels, are said to have been derived from the evening dress worn by a young woman met in London in the early thirties by Prince Bira of Siam, who lived in Europe and was a well-known racer of the time. Bira adopted the scheme for his cars from 1934 until he ...

  7. List of colors (alphabetical) - Wikipedia

    en.wikipedia.org/wiki/List_of_colors_(alphabetical)

    This is an accepted version of this page This is the latest accepted revision, reviewed on 16 February 2025. For other color lists, see Lists of colors. This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources. Find sources: "List of colors" alphabetical ...

  8. Talk:Topaz - Wikipedia

    en.wikipedia.org/wiki/Talk:Topaz

    Why is there no mention in the article of the different shades of blue? Namely sky blue (which is what people usually see when they're shown blue topaz), swiss blue (a sort of neon blue color), and London blue (a deep grayish-blue). --71.131.153.174 20:12, 29 May 2010 (UTC)

  9. Category:Shades of blue - Wikipedia

    en.wikipedia.org/wiki/Category:Shades_of_blue

    This page was last edited on 27 February 2024, at 09:40 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

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