| Abstract: | 1. Alkali metaphosphates and alkali polyphosphates dissolve Prussian blue to potassium ferrocyanide and to the corresponding ferric alkali metaphosphates and polyphosphates. But smaller quantities peptize Prussian blue. The alkali metaphosphates and alkali polyphosphates are the first inorganic substances whose peptizing action on Prussian blue was observed. 2. The alkali salicylates and alkali β-resorcylates react in an analogous way with Prussian blue. They dissolve Prussian blue if sufficient quantities are present. But smaller quantities yield colloidal Prussian blue. 3. The statement in the literature that Turnbull's blue is not peptized by potassium oxalate is erroneous. Simultaneously, the conclusion had to be drawn that Turnbull's blue is an equimolecular mixture of Prussian blue and ferrous ferrocyanide. 4. Data given in the literature describing some reactions leading to colloidal Prussian blue and stating that Prussian blue does not react with hydrobromic acid are erroneous. |
