Ammonium hexacyanoferrate(II) is an inorganic chemical compound with the chemical formula (NH4)4[Fe(CN)6].

[1][2] Neutralization of ferruginous acid with ammonia solution followed by salting with ethanol:[3] Ammonium hexacyanoferrate(II) forms green crystals.

The compound is well-soluble in water, and does not dissolve in ethanol.

It forms hydrates.

[4][5]