Acid test (gold) mark is tested by applying aqua fortis (nitric acid), which dissolves the mark of any item that is not gold. If the mark remains, it is tested by applying aqua regia (nitric acid and hydrochloric acid). If the mark is removed, then this test dissolves the gold, proving the item to be genuine gold. More accurate testing of the item for its fineness or purity can be done through the use of differing strengths of aqua regia and comparative testing of gold items of known fineness. The figurative meaning of the expression, where it is applied to tests of character,
The Electric Kool-Aid Acid Test Kesey is conditionally released as he convinces the judge that the next step of his movement is an "Acid Test Graduation", an event in which the Pranksters and other followers will attempt to achieve intersubjectivity without the use of mind-altering drugs. The graduation was not effective enough to clear the charges from Kesey's name. He is given two sentences for two separate offenses. He is designated to a work camp to fulfill his sentence. He moves his wife and children to Oregon and begins serving his time in the forests of California. "The Electric Kool-Aid Acid Test" is remembered as