It is a brown color, napthenic or paraffinic oil soluble, a premium, cutting oil additive. It is a true synthetic metalworking coolant capable of easily handling most grinding, sawing, turning, boring, milling and drilling operations. GL 1342 forms a stable translucent solution over a wide range of water hardnesses and temperatures. This clarity greatly enhances workpiece visibility. This unique formula is non-corrosive to steel, cast iron, brass, copper, aluminum and carbide tooling.