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2. List of Mamiya products - Wikipedia

   en.wikipedia.org/wiki/List_of_Mamiya_products

   Mamiya Ruby (1959) Mamiya Auto Deluxe (1960) ... The mamiya/sekor 55mm 1:1.4 is known to have radioactive thorium glass elements. Accessories. Flash units. Mamiyalite ZE;

3. Flashed glass - Wikipedia

   en.wikipedia.org/wiki/Flashed_glass

   Ruby flashed glass. Flashed glass, [1] or flash glass, is a type of glass [2] created by coating a colorless gather of glass with one [1] [3] [4] or more thin layers of colored glass. [5] This is done by placing a piece of melted glass of one color into another piece of melted glass of a different color and then blowing the glass. [1] [6]

4. Cranberry glass - Wikipedia

   en.wikipedia.org/wiki/Cranberry_glass

   Vintage cranberry glass bowl 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 ...

5. Binoculars - Wikipedia

   en.wikipedia.org/wiki/Binoculars

   Because a typical binocular has 6 to 10 optical elements [52] with special characteristics and up to 20 atmosphere-to-glass surfaces, binocular manufacturers use different types of optical coatings for technical reasons and to improve the image they produce. Lens and prism optical coatings on binoculars can increase light transmission, minimize ...

6. Glass coloring and color marking - Wikipedia

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

   The color is caused by the size and dispersion of gold particles. Ruby gold glass is usually made of lead glass with added tin. Silver compounds such as silver nitrate and silver halides can produce a range of colors from orange-red to yellow. The way the glass is heated and cooled can significantly affect the colors produced by these compounds.

7. Why birds can cause 9/11 light tribute to go dark at times - AOL

   www.aol.com/why-birds-cause-9-11-174511282.html

   In addition to disrupting migration patterns, the artificial lighting can reportedly disorient the birds and cause them to fly directly into windows.