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OK time for the contraversial post. Salt isn't particularly white! Big pure crystals of salt get used in infra red spectroscopy because they are transparent to IR radiation (across quite a large range). If you look at one of these crystals it looks prettty much like a piece of glass. or, indeed, like a piece of (bubble free) ice.
well water shines if you look at it from an angle. but the light is absorbed as it hits and heats up the water(evaporation). so maybe it shines because the salt in it bounces the light off it. and from an angle it does look white. Right if you evaporate salt water and catch the steam and let it condense back into water and then test it for salt. does it still have some salt in it. If it does then I could be right. Better still why not catch rain water and see if there is any salt there. maybe just a small amount. I think there will be, would someone please go and test some rain water, for me! I dont have the equipment.