selenious acid

Selenious acid is a key component of the Mecke reagent used for drug testing.

Selenous acid, also known as selenious acid, is a chemical compound.

Glyoxal may be synthesized in the laboratory by oxidation of acetaldehyde with selenious acid.

Selenous acid (or selenious acid) is the chemical compound with the formula HSeO.

It is composed of a mixture of selenious acid and concentrated sulfuric acid, which is dripped onto the substance being tested.

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.

The United States Department of Justice method for producing the reagent is the addition of 100 mL of concentrated (95-98%) sulfuric acid to 1 g of selenious acid.