Noun
an unstable acid known only in solution and as chromate salts
Source: WordNetRoy Beck, Charles Peter and Edward Owens studied and experimented with chromic acid salt sensitized emulsions for photo-reactive stencils. Source: Internet
The zinc disc was then immersed in a bath of chromic acid; this etched a groove into the disc where the stylus had removed the coating, after which the recording could be played. Source: Internet