I use a modified version of the Kodak R-9 potassium dichromate bleach recipe for bleaching black and white _reversal_ Plus-X, Tri-X, and Fomapan R movie film. Can anyone tell me what is the shelf life of the mixed bleach? What about capacity for reversal purposes? It gets very cloudy with lots of sediment quickly when used for movie film reversal bleaching. I store the used R-9 in a separate container from the clean unused bleach, but I typically only use it for three or four 50 foot rolls of 8mm film before dumping it since I'm unsure of the capacity or the effect of the cloudy sediment. Here is the formula I use. Kodak Bleach R-9 Water 1.0 L Potassium Dichromate (anhydrous) 9.5 g Sulfuric Acid (Concentrated)* 12.0 ml * CAUTION: Always add the sulfuric acid to the solution slowly, stirring constantly, and never add the solution to the acid; otherwise, the solution may boil and splatter the acid, causing serious burns. Note: I substitute 36 ml regular automotive battery acid for the 12.0 ml concentrated Sulfuric Acid since battery acid is about 1/3 the concentration of concentrated Sulfuric Acid. I've also read that you can substitute 66g Sodium Bisulfate for the Sulfuric Acid, but I haven't tried it.