Salt

Salt in period times was mostly obtained from evaporating sea water. It was also used as an item for trade.

References

• http://www.wikipedia.org/wiki/Sea_salt
• Salt: grain of life / by Pierre Laszlo ; translated by Mary Beth Mader. [Chemins et savoirs du sel]. New York : Columbia University Press, c2001. ISBN 0231121989
• Salt: a world history / Mark Kurlansky. New York : Walker and Co., c2002. ISBN 0142001619