Thin, transparent brown, red-brown, or garnet red scales or granules, or as a brown - yellow powder, or as transparent green crystals.
Very soluble in water, but is insoluble in alcohol.
1). A 0.5 gm sample, when ignited, chars and leaves a residue of iron oxide.
2). A white precipitate is formed.
3). A red – brown precipitate is formed, and ammonia is evolved when the mixture is heated.
No blue precipitate forms.
Not more than 2 mg/kg.
Not more than 1 mg/kg.
No turbidity develops
Not more than 0.3 % w/w.
Not less than 16.5 % w/w and not more than 18.5 % w/w of Iron (Fe).