Recently I came upon a posting for a no sulfite developer using baking soda, lye drain opener, vitamin c and phenidone. The quantity of phenidone is so small that you use .4 grams (yes .4) to 50ml of alcohol. To make 250ml of stock solution you extract .65ml of that concentrate with the other chems and then you dilute it 1+3 for film!! By my calculations I'll get 37,000 rolls of film out of that 50 grams of Phenidone at a cost of .00005 cents per roll for that chemical. I think I have some phenidone I can share with friends