Synonyms: Red prussiate CAS: 13746-66-2 Molecular Formula: K3Fe(CN)6 Molecular Weight: 329.24 g/mol Test Specification Appearance Ruby red crystals Assay 99% min. Chloride (Cl) 0.01% max. Sulfate SO4) 0.01% max. Insoluble Matter 0.005% max. Ferro Compounds (as [Fe(CN)6]4- 0.05% max.