catalyst, mordant, developer, weight increasing agent, corrosion inhibitor and metal surface treatment agent. Molecular formula: Fe(NO3)3.9H2OMolecular weight: 404.02Physicochemical properties:1) purple crystal 2) Specific density: 1.683) Melting point: 47.2°C. When it is heated at 125°C, it decomposes4) Subject to deliquescence and easily dissolves in water, ethanol and acetone while it has ...