Note:  Do not rely on this information. It is very old.

Chromic Acid

Chromic Acid, H2Cr04, forms red crystals by cooling a solution of chromium trioxide, Cr03. This latter substance is also frequently known by the name of the acid, and it is prepared by the action of sulphuric acid on potassium bichromate, and forms long scarlet deliquescent crystals. It is a very powerful oxidiser, and is much used as such in organic chemistry. A dilute solution is also used largely in microscopic work for the purpose of staining and hardening animal tissues.