Our Coarse Grey Sea Salt owes its colour to the clay-bottom pans of salt marshes from which it is hand-harvested after the evaporation of seawater by the combined action of the wind and the sun. Our sea salt is a source of minerals (sodium, magnesium, potassium, calcium) and trace elements (iron, manganese, zinc). Did you know? Nearly 3000 tonnes of sea salt are collected each year on the island of Noirmoutier.