Ammonium iron(III) hexacyanoferrate(II)

Ammonium iron(III) hexacyanoferrate(II), also known as Giese salt, AFCF, or C.I. 77510, is an inorganic iron-cyanide complex registered under CAS 25869-00-5 and EC 247-304-1. It carries no assigned E-code and is commercially referenced under designations such as Blue MF 4905.

In textile and leather processing, AFCF functions as a surface-active colorant that modifies substrate wetting behaviour, enabling uniform dye penetration and adhesion across fibrous materials. In coatings and printing applications, it contributes to pigment dispersion stability by influencing interfacial tension between the pigment particle and the carrier medium.

AFCF is supplied as a technical-grade powder and is subject to REACH registration requirements for EU market access. Procurement quantities typically range from kilogram to tonne-scale packaging depending on application volume. Buyers should confirm grade specification and documentation requirements, including safety data sheets aligned with EU GHS/CLP regulation.