Acid test
any qualitative chemical or metallurgical assay which uses acid; most commonly, and historically, the use of a strong acid to distinguish gold from base metals
en-GB/ˈæsɪd ˈtɛst/
en-US/ˈæsɪd ˈtɛst/
any qualitative chemical or metallurgical assay which uses acid; most commonly, and historically, the use of a strong acid to distinguish gold from base metals