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Pliny the Elder wrote 120 historical remarks on this substance, noting how it names a reward bestowed upon winning soldiers, giving us our modern word "salary." A 1930 march to Dandi that protested a British (*) tax on this substance was led by Mahatma Gandhi, who produced this substance illegally by boiling off seawater. For 10 points, name this commonly iodized food preservative, found with pepper on Western table settings.
Pliny the Elder wrote 120 historical remarks on this substance, noting how it names a reward bestowed upon winning soldiers, giving us our modern word "salary.
(table, rock, or sea) salt (accept sodium chloride before mentioned)