Acid Tests

The Acid Tests were a series of parties held by author Ken Kesey in the San Francisco Bay Area  during the mid-1960s, centered entirely around the use of, and advocacy of, the psychedelic drug LSD, also known as "acid."  LSD-25 was not made illegal until late in 1968.

Acid test or acid tests may refer to:

• Acid test (gold), a chemical or metallurgical test that uses acid, now also a general term for verified, approved, or tested in a large number of fields
• Quick ratio, also known as acid-test ratio or acid-test liquidity ratio, a measure of a company's cash liquidity
• Acid Test (band), a Canadian alternative rock band
• ACID-TEST, a Japanese band headed by singer Kazutoshi Sakurai
• The Acid Tests, parties conducted by the Merry Pranksters, centered on the use of LSD (acid)
• The Acid Test, a science quiz from 1994 to 1997 on BBC Five Live, hosted by Kate Bellingham
• Acid1, Acid2 and Acid3, test suites for web browsers
• Within a Petrocalcic Horizon, the use of hydrochloric acid to test rock or soil for carbonates