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Salt has played a prominent role in determining the power and location of the world's great cities. Liverpool rose from just a small English port to become the prime exporting port for the salt dug in the great Cheshire salt mines and thus became the entrepôt for much of the world's salt in the 19th century. [5]
An ounce of salt could once be traded for an ounce of gold. Now, the idea is laughable, with the cost of gold reaching over $2,000 per ounce while 26 ounces of salt is valued at just $1.
Salt was used as a currency during the Roman Empire, and towards the end of their reign the Romans began monopolising salt in order to fund their war objectives. Salt was such an important commodity during the Middle Ages that salt production facilities became some of the first state-owned enterprises. Salt is one of the longest standing ...
Salt became an important article of trade and was transported by boat across the Mediterranean Sea, along specially built salt roads, and across the Sahara on camel caravans. The scarcity and universal need for salt have led nations to go to war over it and use it to raise tax revenues.
Diorama of an underground salt mine in Germany. Inside Salina Veche, in Slănic, Prahova, Romania.The railing (lower middle) gives the viewer an idea of scale. Before the advent of the modern internal combustion engine and earth-moving equipment, mining salt was one of the most expensive and dangerous of operations because of rapid dehydration caused by constant contact with the salt (both in ...
A chemistry professor explains the science that makes salt a cheap and efficient way to lower freezing temperature.
By the Ming dynasty, salterns in the salt marshes of northern Jiangsu and the eastern seaboard at Changlu, Bohai Bay, near present-day Tianjin, became the largest salt producers and by the late 19th century supplied some 80% of China's salt. Over the course of the 20th century, industrial evaporators replaced these coastal salterns.
Salting became economically feasible during the 17th century, when cheap salt from Southern Europe became available to the maritime nations of Northern Europe. The method was cheap, and the work could be done by the fisherman or his family.