We have food/edible grades of salts, both in Sea Salt as well as Himalayan Pink Rock Salt, these are used in numerous food related industries like bread making, confectionary, bakery, cereals, butter and cheese, pickles and spices, etc., not to mention everyday kitchen and cooking needs in every household.
As shown in pictures, there are different 100% natural color shades of Himalayan Pink Salt available, different markets prefer different color shades and these color variations are due to differences in specifications and minerals content e.g. dark shades can indicate that the mineral content of iron oxide is higher than found in lighter shades of pink salt, even if coming out of the same mine shaft.