rock salt, which is cheaper than white salt and used on roads, often leaving brown residue, and white de-icing salt, which leaves no residue and is used to de-ice schools, hospitals, and offices.' ...

This operation could be advantagQously applied to pnrifying rock salt. This salt, which is perceptibly purer than sea salt, nevertheless contains earth and foreign matters, which give it a brown ...

spokesperson Sean Brown said. In contrast, Bethlehem is among the municipalities feeling crunched on salt supplies. By mid-February, Bethlehem had used about 40% more rock salt than it averages ...