Salt, Humble Seasoning, Sustains Life, Industry By DONALD J. FREDERICK Salt once was traded ounce for ounce• 1th gold. As the Roman statesman Cassiodorus observed, "Some seek not gold, but there lives not a man who does not need salt." The Romans knew what they were talking about. The humble saltshaker on the modern dinner table contains the very essence of life. A blend of sodium and chlorine, salt regulates the exchange of water between human cells and the surrounding fluid which carries food in and wastes out. Sodium is involved in muscle contraction, including heartbeats; in nerve impulses; in the digestion of body-building protein. Keeps Body Stable Without salt the body goes into convulsions, paralysis, death. Blood cells in a salt-free fluid burst. The salt that keeps man alive does the same for industry as the most essential of all raw materials, reports Gordon Young in the National Geographic. Only a pinch of salt, perhaps 5 percent of the world's annual production, ends up as a seasoning on the dinner table. Most of it pours into chemical plants where it leads the five major raw materials used by industry: salt, sulfur, limestone, coal and petroleum. Salt has some 14,000 industrial uses, more than any other mineral. Salt pickles cucumbers-and metals; helps pack meat, can vegetables, cure leather, make glass, bread, butter, cheese, rubber, wood pulp. As salt-or broken down into sodium and chlorine- it goes into gargles, textiles, and rocket fuels; cosmetics, paints, pharmaceuticals, and photography; soaps, dyes, ceramics, batteries, adhesives, and explosives. The freezing point of a saturate solution-21 degrees C lower than that of fresh water-makes rock salt an excellent refrigerant, snow melter, and freezer of ice cream. And liquid sodium cools nuclear reactors. May Store Wastes The wastes from nuclear reactors may ultimately be stored in salt beds deep beneath the surface of the earth. Their dryness ability to withstand earthquakes, and a melting point of 800 degrees C make salt deposits the safest nuclear graveyards, scientists contend. Salt already serves as a valuable storage facility. The world's biggest warehouse near Hutchinson, Kan., was carved from a worked-out portion of a salt mine. Owned by the Underground Vaults and Storage Company, its 300 acres of storage bays reach 650 feet below the surface of the earth. A seed company sends down a bag or two of each new strain it develops so no surface light may annihilate the strain. Corporations store vital papers, microfilm documents, product formulas. One also keeps folding cots and a food supply, for use in case of nuclear war. Other treasures salted away include more than 100,000 reels of classic films such as "Gone With The Wind," Bibles, furs, paintings, stamp and coin collections, and wedding dresses. "For a flat fee," says one of the company's executives, "we'll store a bride's wedding gown for 21 years. The salt air will preserve it - perennial 50 percent humidity and 68 degree temperature. Her daughter can get married in it. Then, who knows, it may go underground again for the next generation." Men have credited salt with qualities far beyond price for many generations. It betokens wit, wisdom, virility, hospitality, sanctity. Homer dubbed it "divine;" Plato hail£tf It as "a substance dear to the gods." And "Ye are the salt of the earth," the Bible says. Priced at Pennies With salt among the earth's most abundant minerals and priced today at pennies per pound, it's difficult to believe it was once so precious and created so many legends. But ancient man had only limited access to it in the form of brine that bubbled up, scarce surface deposits, and some bay salt. Rising sea levels-ten feet in the first millennia B.C. and A.D.-drowned coasts and solar salt pans, causing salt famines. Drilling-55 percent of U. S. production comes from brine wells 750 to 7,000 feet deep-had to wait for technology. Even then it was unpredictable. To their disgust, early salt drillers sometimes brought up nasty-smelling, sticky black stuff "of no conceivable use whatever." The "worthless" goo was oil. 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