pA process for preparing ferrous picrate is disclosed. The process includes the step of reacting under substantially non-oxidising conditions ferrous carbonate substantially free from ferric compounds with a substantially water-free solution of picric acid in a solvent medium to produce a solution of ferric picrate. The solvent medium is selected from aromatic hydrocarbon solvents, mixtures of aromatic hydrocarbon solvents, straight- or branched- chain aliphatic alcohols, mixtures of straight- or branched- chain aliphatic alcohols, and mixtures of straight- or branched- chain aliphatic alcohols and aromatic hydrocarbon solvents. The reaction is preferably carried out under a continuously maintained inert atmosphere and at a temperature between 10 DEG C and 120 DEG C./p [WO9426689A1]
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