ATP inhibits the rate of ferricyanide reduction. It is isomorphous with potassium ferricyanide. It donates an electron, becoming oxidized to ferricyanide (). Violent reactions have also been reported with acetaldehyde, hypochlorite solutions, potassium ferricyanide and peroxides. "tert"-butyl hydroperoxide ("t"BHP), and potassium ferricyanide (KFe(CN)). Similar increases in the rate of ferricyanide reduction can be stimulated by a dilution technique. The best known is a process using ammonium ferric citrate and potassium ferricyanide. Several photographic print toning processes involve the use of potassium ferricyanide. Ferrocyanide and its oxidized product ferricyanide cannot freely pass through the plasma membrane. The best known is probably a process using ammonium ferric citrate and potassium ferricyanide. Laboratory settings often use potassium ferricyanide or potassium periodate for the catalyst. Some stains, such as osmium tetroxide and osmium ferricyanide, are very chemically active. The process uses two chemicals&colon; ferric ammonium citrate and potassium ferricyanide. Excess ammonium ferric citrate and potassium ferricyanide are then washed away. Previously potassium ferricyanide was often used as bleach.