This is more popularly, though incorrectly, termed chromic acid and should contain not less than 90 per cent, of CrO3.

Properties : Chromium trioxid occurs as needle-shaped crystals or prisms of dark purplishred color and metallic luster; it is odorless, destructive to animal and vegetable tissue, deliquescent in air and very soluble in water (1 :0.5).

Incompatibilities : Because of its powerful oxidizing properties chromium trioxid should not be brought in contact with alcohol, glycerol or other oxidizable substances or explosion may result.

Action and Uses: In medicine chromium trioxid is used only as a caustic either in the solid form or in aqueous solution. Holt recommends in nasal hemorrhage from ulcer of septum to touch the ulcer with chromium trioxid.