Process for the production of Berlin blue

Details Process for the production of Berlin blue Process for the production of Berlin blue

1975-06-26

1976-10-12

Douglas, Winston A.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

423367, C09C 126

Patent

active

039855716

ABSTRACT:
Berlin blue is produced by converting (a) calcium ferrocyanide, sodium ferrocyanide or magnesium ferrocyanide with (b) an iron II salt at a pH below 7 to an acidic iron II salt of ferrocyanic acid FeH.sub.2 [Fe(CN).sub.6 ]. The calcium or sodium ions can be washed out of the precipitate of the ferrocyanic salt. The precipitate is treated with (c) an inorganic or organic potassium salt to form Berlin white and then oxidized to Berlin blue. Alternatively, (a), (b) and (c) can be reacted together at a temperature of 20.degree. to 60.degree.C. to form Berlin white directly.

REFERENCES:
patent: 2005697 (1935-06-01), Grove
patent: 2005698 (1935-06-01), Grove

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