The formation of blue salt occurs through a slow, natural process in which ancient seawater evaporates, leaving behind mineral-rich salt deposits deep underground. The blue color comes from light scattering within the crystalline structure and the presence of specific minerals, including sylvinite and potassium chloride. Because the color is completely natural, blue salt is free from ... https://www.youtube.com/watch?v=i-ztdOG1mlQ