Dissolve 200g sodium citrate, 75g sodium carbonate and 125g potassium thiocynate in about 600 ml water. Dissolve separately, 18g copper (11) sulphate in 100 ml water. When the solutions have cooled, mix them together with stirring. Now add 5 ml of a 5% potassium ferrocyanide to the solution, and make up to 1 liter.
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