Description
Selenous (Selenious) Acid, Dry Granular, Lab Grade, Argon Packed.
SELENOUS ACID is Hygroscopic and Potentially Deliquescent. Keep Tightly Capped When Storing to prevent incursion of atmospheric O2 and moisture. Store in a de-humidified area if possible.
The major uses are in protecting and changing the color of carbon steel, especially steel parts on firearms. The cold-bluing process uses selenious acid, copper(II) nitrate, and nitric acid to change the color of the steel from silver-grey to blue-grey or black. Alternative procedures use copper sulfate and phosphoric acid instead. This process deposits a coating of copper selenide and is fundamentally different from other bluing processes which generate black iron oxide. Some older razor blades were also made of blued steel.
Another use for selenious acid is the chemical darkening and patination of copper, brass and bronze, producing a rich dark brown color that can be further enhanced with mechanical abrasion (buffing, burnishing).
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