James Silverton wrote:
>
> I've seen evaporating ponds in Hawaii and, even if the liquid and salt
> are colored, they just seem to be incorporating local powdered rock. I
> guess that constitutes minerals.

Pure dried seawater contains several salts
which are removed when making pure sodium
chloride, such as salts of potassium and bromine.
They contribute flavors generally described
as "metallic" or "off-flavor".