"Salt" is the colloquial term for the chemical compound sodium chloride (NaCl). It is principally obtained by four processes:
- by mining of rock salt. In Germany, approx. 90% of all NaCl is obtained in this way.
- by the evaporation of natural or artificial saturated aqueous NaCl solutions. This may proceed with the aid of brines, which are obtained by pumping water into underground salt beds or from salt works ("boiled salt").
- by evaporation of saline seawater collected in large ponds of water from salt lakes in hot countries (such as Spain or Southern France). This salt is also called sea salt.
- as a by-product of seawater desalination for obtaining drinking or process water.
Salt has a solid, crystalline structure and is very hygroscopic. It attacks metals when combined with moisture. (Also known as VACUUM SALT)
When shipped in bags contact with metal results in rusting of the metal, which stains and rots the bags. When handled, the bags burst at these points, with a consequent loss of contents. Should the sacks be repaired, careful attention should be paid to the re-sewn portions of the bags, as this loss might be confused with that due to "normal tearing." The salt nearest to the torn part of the bag is usually rust stained. Damaged salt, if unfit for the purpose intended, may attract a reasonable figure for agricultural purposes.
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