Salt

Salt has been a precious commodity throughout most of history, despite its simple nature.

Rome's armies were paid in salt (the origin of the word 'salary').

Salt is a seasoning, an essential nutrient, but also a very important preservative.

Table salt is sodium chloride combined with iodine sources (for nutrition), stabilizers for the iodine, and anti-caking compounds to make it pour by preventing it from absorbing water from the air.