an aqueous solution of chromic acid. Often applied as a solution of sodium dichromate in sulphuric acid, used for cleaning glassware and etching plastics etc.
The glasses shall be cleaned using unperfumed soap or detergent and shall then be rinsed repeatedly until the cleaning agent has been totally eliminated. The final rinse shall be with distilled water, after which the glasses shall be left to drain and then dried in a desiccation stove.
Neither concentrated acids nor chromic acid mixtures shall be used.
