3955. To Obtain Hydroferridcyanic Acid

3955. To Obtain Hydroferridcyanic Acid. Prepared by decomposing recently precipitated ferridcyanide of lead by sulphuretted by hydrogen, or by sulphuric acid carefully added. A yellow solution is thus obtained, which yields a deep brown powder when evaporated by heat, or yellow Crystals by spontaneous evaporation.

3956. Hydroferrocyanic Acid

3956. Hydroferrocyanic Acid. A peculiar compound of* cyanogen, hydrogen, and iron, discovered by M. Porret, and called