appearance:a yellowish white to yellowish gray powder Loss on drying :Max.0.5% Acidity:3.0 to 5.0 Iron:Max.80 ppm. Halquinol is a controlled mixture of chlorhydroxyquinolines. The constituents act synergistically to enhance biological activity.The antimicrobial effects of halquinol derives from its ability to chelate metal ions, particularly iron, copper and zinc. In bacteria, fungi and protozoa, ...