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2. Anodizing - Wikipedia

   en.wikipedia.org/wiki/Anodizing

   Interference-colored anodized aluminum parts exhibit a distinctive quality: their color varies when viewed from different angles. [ 24 ] [ better source needed ] The interference coloring involves a 3-step process: sulfuric acid anodizing, electrochemical modification of the anodic pore, and metal (tin) deposition.

3. Chemical coloring of metals - Wikipedia

   en.wikipedia.org/wiki/Chemical_coloring_of_metals

   Black for aluminum. Boil a solution of 20 g ammonium molybdate and 5 g of sodium thiosulfate in a liter of water, immerse the objects, rinse, dry, wax or lacquer after the development of color. [31] Lustre colours. Use a solution of 280 g of sodium thiosulphate, 25 g of cupric acetate and 30 g of citric acid. It can be used on copper and its ...

4. Chromate conversion coating - Wikipedia

   en.wikipedia.org/wiki/Chromate_conversion_coating

   The formula was meant to be dissolved in water at the concentration of 9.0 g/L, giving a bath with pH = 1.5. It yielded a light gold color after 1 min, and a golden-brown film after 3 min. The average thickness ranged between 200 and 1000 nm. [6] Iridite 14-2 is a chromate conversion bath for aluminum.

5. Reynolds Wrap Aluminum Foil Is Now Color-Coded—Here’s What ...

   www.aol.com/reynolds-wrap-aluminum-foil-now...

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6. Conversion coating - Wikipedia

   en.wikipedia.org/wiki/Conversion_coating

   A conversion coating is a chemical or electro-chemical treatment applied to manufactured parts that superficially converts the material into a thin adhering coating of an insoluble compound.

7. Photosensitive anodized aluminum - Wikipedia

   en.wikipedia.org/wiki/Photosensitive_Anodized...

   Photosensitive anodized aluminum was qualified to Federal Specification GG-P-455 in 1965, a document that outlines the performance of Type 1 and Type 2 photosensitive anodized aluminum. [3] Since qualification to GG-P-455, photosensitive anodized aluminum has been specified by many military, government and industrial organizations, including: