Chromic Acid By Jateen Trading Co.

Chromic acid is an intermediate in chromium plating, and is also used in ceramic glazes, and colored glass. Because a solution of chromic acid in sulfuric acid (also known as asulfochromic mixture or chromosulfuric acid) is a powerful oxidizing agent, it can be used to clean laboratory glassware, particularly of otherwise insoluble organic residues. This application has declined due to environmental concerns.

Furthermore the acid leaves trace amounts of paramagnetic chromic ions A AcAca A Aca A Cr(III) A AcAca A Aca A that can interfere with certain applications, such as NMR spectroscopy. This is especially the case for NMR tubes.
Chromic acid was widely used in the instrument repair industry, due to its ability to "brighten" raw brass. A chromic acid dip leaves behind a bright yellow patina on the brass. Due to growing health and environmental concerns, many have discontinued use of this chemical in their repair shops