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  2. Optical filter - Wikipedia

    en.wikipedia.org/wiki/Optical_filter

    An optical filter is a device that selectively transmits light of different wavelengths, usually implemented as a glass plane or plastic device in the optical path, which are either dyed in the bulk or have interference coatings. The optical properties of filters are completely described by their frequency response, which specifies how the ...

  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. Wratten number - Wikipedia

    en.wikipedia.org/wiki/Wratten_number

    Wratten number. Wratten numbers are a labeling system for optical filters, usually for photographic use comprising a number sometimes followed by a letter. The number denotes the color of the filter and its spectral characteristics, and these numbers can be grouped into broad categories, but the numbering system is arbitrary within a group and ...

  5. Tristimulus colorimeter - Wikipedia

    en.wikipedia.org/wiki/Tristimulus_colorimeter

    Color calibration of a monitor using ColorHug2, an open-source colorimeter, placed on the screen. A tristimulus colorimeter, colloquially shortened to colorimeter or colourimeter, is used in digital imaging to profile and calibrate output devices. It takes a limited number of wideband spectral energy readings along the visible spectrum by using ...

  6. Oakley, Inc. - Wikipedia

    en.wikipedia.org/wiki/Oakley,_Inc.

    Oakley, Inc. is an American company headquartered in Foothill Ranch, California, which is an autonomous subsidiary of Luxottica.The company designs, develops and manufactures sports performance equipment and lifestyle pieces including sunglasses, safety glasses, eyeglasses, sports visors, ski/snowboard goggles, watches, apparel, backpacks, shoes, optical frames, and other accessories.

  7. Cranberry glass - Wikipedia

    en.wikipedia.org/wiki/Cranberry_glass

    Cranberry glass. The beaker with lid made from Gold Ruby is attributed to Johann Kunckel. Cranberry glass or 'Gold Ruby ' glass is a red glass made by adding gold salts or colloidal gold to molten glass. Tin, in the form of stannous chloride, is sometimes added in tiny amounts as a reducing agent. The glass is used primarily in expensive ...

  8. Chelsea filter - Wikipedia

    en.wikipedia.org/wiki/Chelsea_filter

    The "chelsea" filter was originally devised by Anderson and Payne in 1934 of the Gem testing Laboratory of the London Chamber of Commerce & Industry.The filter was devised with the collaboration of gemmology students of the Chelsea College of Science and Technology where Basil Anderson was an instructor for the Gemmological Association of Great Britain.

  9. Wood's glass - Wikipedia

    en.wikipedia.org/wiki/Wood's_glass

    Wood's glass is special barium - sodium - silicate glass incorporating about 9% nickel oxide. It is a very deep violet-blue glass, opaque to all visible light rays except longest red and shortest violet. It is quite transparent in the violet/ultraviolet in a band between 320 and 400 nanometres with a peak at 365 nanometres, and a fairly broad ...

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