Martha’s Vineyard Sea Salt is the Vineyard’s first operating salt works in nearly 200 years! Before the invention of modern-day refrigeration, salt was essential to life on Martha’s Vineyard — and throughout the colonies. Salt preserved food, made it more palatable, and was used to tan hides and pack fish for trading — all important to the Vineyard’s economy. According to the “Dukes County Intelligencer,” the first known salt works on the Vineyard was up and running by 1778. By 1807, salt manufacturing was the island’s second largest industry.