REACTION BETWEEN FERRIC CHLORIDE AN'D AMMONIUM THIOCYANATE

On subjecting ferric chloride and ammonium thiocyanate to electrolysis, cataphoresis in an agar-agar gel and diffusion through filler paper at different temperatures, the red colour dis­charged around the cathode in electrolysis. The red boundary moves towards the cathode in cataphoresis. This apparent contradiction is easily understood because the red particles carry positive charges but are at the same time easily reducible. It appears from the diffusion experiments that the red particles may be colloidal in nature.