This is copied from the post on edge effects. Mix 1/2 teaspoon of Phenidone with a little isopropyl rubbing alcohol to make it easier to dissolve in water. Mix a couple of ounces of water, 2 teaspoons of ascorbic acid powder and 1 teaspoon of sodium bicarbonate and stir til the effervescence subsides. Warm it slightly to get more CO2 out. Add this mixture, the Phenidone, two teaspoons of borax and enough cold water to make 1 liter. Use it full strength or diluted as you would use D-76. At full strength it can be reused for at least 8 36 exp. or 8x10 films. All the teaspoon measures are levelled standard cooking measuring spoons.