Preparation of red blood salt (potassium ferricyanide) of yellow blood salt (potassium ferrocyanide)
To a hot solution of 20 g of yellow blood salt in 200 mL of water introducing chlorine. The reaction will end if he does not drop the reaction mixture with a solution of ferric salts blue precipitate of Prussian blue. Then boil and thicken solution to crystallize. After cooling, the crystals exclude red blood salts. The crystals sucked and recrystallized. The resulting crystals are red without water of crystallization. The mother solution containing potassium chloride and the rest not excreted red blood salt.