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Salt tastes biting, puckery, savory, zesty, piquant. Salt tastes like any of numerous compounds that result from replacement of part or all of the acid hydrogen by a metal or a group acting like a metal. Directly on the tongue, salt tastes biting and puckery. In your eye or on a broken skin part it can sting fiercely.
Save. Sour salt is crystallized citric acid, a weak acid derived from citrus fruits such as lemons and limes. Sour salt is used as a seasoning to add a soft pucker to lemonade, borscht and other recipes. It also is used in canning and helps preserve foods such as apples and pears, which otherwise darken or soften.