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===Refined salt===
[[Image:Salt refining-Lake Mariout.JPG|thumb|200px|left|[[Salt evaporation pond]] in [[Alexandria]], [[Egypt]]]]
Refined salt, which is most widely used presently, is mainly sodium chloride. Only about 7% of refined salt is used as a [[food additive]].{{fact}} The majority is sold for industrial use, from manufacturing pulp and paper to setting dyes in textiles and fabric, to producing soaps and detergents, and has great commercial value.{{Fact|date=April 2007}}
The manufacture and use of salt is one of the oldest chemical industries.{{Fact|date=April 2007}} Salt is also obtained by evaporation of [[sea water]], usually in shallow basins warmed by [[sunlight]];{{Fact|date=April 2007}} salt so obtained was formerly called bay salt, and is now often called sea salt or solar salt.{{Fact|date=April 2007}} Today, most refined salt is prepared from rock salt: mineral deposits high in edible salt.{{Fact|date=April 2007}} These rock salt deposits were formed by the evaporation of ancient salt lakes.{{Fact|date=April 2007}} These deposits may be [[mining|mined]] conventionally or through the injection of water. Injected water dissolves the salt, and the [[brine]] solution can be pumped to the surface where the salt is collected.{{Fact|date=April 2007}}
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