The production of salt as a food supplement for man and beast is as old as civilization itself. Salt was produced in shallow ponds of sea water through evaporation and by mining rock salt from large land locked deposits. The salt from the Hallstatt Mine was exported and traded to the Celtics. Salt was also an important force in the African slave trade as captured children from warring tribes were sold into slavery in exchange for salt. In other parts of salt poor Africa humans developed the practice of drinking cattle blood or urine to obtain salt.
Salt is known as the universal and most widely used food supplement and condiment.
So great is the human craving for salt, and the relish of it that we are led to consider that a love of it is one of the most dominating of our natural instincts and that salt itself is in fact necessary to the health and even the life of man.