The reduction of ferricyanide ion at nickel, stainless steel and platinum rotating disc electrodes has been studied in KOH and K2CO3 supporting electrolytes. The effects of time, cathode material and supporting electrolyte were investigated. It was concluded that the limiting current supported by ferricyanide reduction falls rapidly with time due to the formation of a film on the electrode surface which requires abrasive cleaning for its removal. This deterioration was found to be dependent upon both the electrode material and the supporting electrolyte. Platinum was found to be the most dependable surface with both supporting electrolytes, although with the latter it is marginally better.