Acids. A class of chemical substances remarkable for their sour taste and their readiness to unite with alkalies and earths to form salts: there are many hundred acids, distributed in the three kingdoms of nature. With one exception the red den vegetable blue colors, as blue ca bage and litmus. Some exist naturally in the mineral, animal, and vegetable world, and some are the result of chemical pro cesses: a few are solid bodies and some gaseous, but the greater number are in the li uid form.
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