Which taste was recognised as characteristic of acids in the eighteenth century?

1. Eighteenth century chemists catalogued acids by observable properties. 2. A sour taste was one of the recognised characteristics. 3. They also saw acids liberate a gas from limestone, now known to be carbon dioxide. 4. Tasting reagents is of course no longer an acceptable laboratory test. _Source: OpenStax Chemistry (CC BY 4.0), Ch 14 "Acid-Base Equilibria", section 14.1 Brønsted-Lowry Acids and Bases_