Products – Anmol Chemicals Private Limited

Selenious Acid USP

Selenious acid is the chemical compound with the formula H2SeO3. Structurally, it is more accurately described by (HO)2SeO. It is the principal oxoacid of selenium; the other being selenic acid.


Selenious acid is used in changing the color of steel, especially the steel in guns, the so-called “bluing” process which uses selenous acid, copper(II) nitrate, and nitric acid to change the color of the steel from silver-grey to blue-grey. 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.


Chemical Name: Selenious Acid
Mol. Formula: H2SeO3
Mol. Weight: 128.97g/mol
CAS No.: 7783-00-8


General Specifications

Test Specification…USP
Appearance White hygroscopic crystals
Solubility Very Soluble in Water and soluble in ethanol
Residue on Ignition Maximum 0.01%
Insoluble matter Dissolve 1 g in 5 mL of water: it dissolves completely and the solution is clear.
Selenate and sulfate Specified test. no turbidity or precipitate is formed in 10 minutes
Organic volatile impurities Passes test
Residual solvents Passes test
Assay Not less than 93% and not more than 101% of H2SeO3


Shelf life, Storage and Packing

It should be stored in a segregated area in a cool and ventilated place away from combustible materials. Keep in a tightly closed container, sealed until ready for use. It is packed in 25kg or 50kg HDPE bags or drums as required.


We Manufacture Bulk Dugs/API, Excipients, pharmaceuticals (IP/BP/USP/NF/PH. EUR./JP), Speciality Chemicals (Pure/AR/ACS), mineral fortifiers (FCC). our manufacturing facility is GLP, GMP (FDA) approved, ISO 9001, ISO 14001, ISO 22000, FSSC 22000, FSSAI, kosher, halal, COPP and WHO-GMP certified.

Good Manufacturing Practice Certified by World Health Organization (WHO-GMP)
Written Confirmation Certification (WC)
Good Manufacturing Practice (EXCiPACT cGMP)
Good Manufacturing Practice (cGMP)
Good Laboratory Practice (GLP)