Browse phrases beginning with: [A][B][C][D][E][F][G][H][I][J][K][L][M][N][O][P][Q][R][S][T][U,V][W][X,Y,Z] Acid testMeaning A sure test, giving an incontestable result. Origin In the California Gold Rush, in the second half of the 19th century, prospectors and dealers needed to be able to tell gold from base metal. Gold doesn't react to most acids as other metals do, although it does dissolve in Aqua regia (a mixture of hydrochloric acid and nitric acid). To confirm that a find was gold it was given 'the acid test'. Various other tests can be made by the use of acid and these are all called 'acid tests'. The earliest citation I know of of a figurative use of the phrase (i.e. one where no actual acid is referred to) is from the Wisconsin paper The Columbia Reporter, November 1845:
A punning variant of the term arose in the 1960s hippy community. The 'acid test' in that context determined whether users could cope with the psychological demands of taking the drug. This is cited in Maurer and Vogel's Narcotics and Narcotic Addiction, 1967:
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