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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.
Sodium chloride is readily water-soluble, so if this crude salt were exposed to condensation or rain water, the sodium chloride could be dissolved and removed, and the salt could in effect lose its saltiness. Also, the salty flavour is detected by our sense of taste. If there were a physiological change in the functioning of our taste buds, salt consumed may no longer taste the same, but this would not be due to any inherent change in the salt itself. In summary, salt, i.e. sodium chloride, is a very stable material which retains its properties when stored dry.