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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.
R.M., Des Plaines. A--Sour salt is not salt, but it is an effective substitute for salt. Certainly it is not salt with lemon juice added as your friend misinformed you. Sour salt resembles salt, however, in that it comes in a white crystal form that looks like salt and it adds excitement--like salt does--to food.