French Grey Sea Salt from Brittany, France. Grey Sea Salt, known in France as Sel Gris, is the perfect everyday salt for seasoning as it adds full, rich flavor to all foods. This salt is a favorite of top chefs in France and around the world for its incredible flavor. Grey sea salt is hand-harvested using wooden rakes and methods that have been used for hundreds of years. The grey color comes from the salt crystallization on the clay of the salt beds.