... 1. In Metallurgy industry: as precipitating and separating function for Rare-earth metal. 2. In pharmaceutical industry: used ... Phenobarbital, and Borneol, etc. 3. In Light industry: polishing for Marble, rust-remover, bleaching, dirt-remover, leather-processing, wood ... and printing industry, as bleaching agent for textile, substitute for Acetic acid, as coloring mordant for fast pigment dyestuff. 5. In ...