For those who may want to try a Pyro paper developer, the following is the latest formulation that I have worked with: 43 gm Sodium Sulfite .3 gm Phenidone 10 gm Catechol 5 gm Pyrogallol 50 gm Sodium Carbonate 3.5 gm Potassium Bromide Water to make 1 liter Dilute 1-1 to make 2 liter of use solution The phenidone should be diluted in alcohol just as in the Pyrocat formula As in all cases where exposure to Pyrogallol is involved, eye protection, nitrile gloves, and respirator should be worn. (Just as in any pyro formulation). My early tests indicate this is a very active developer that shows good tonal separation throughout the print scale. Paper speeds are typically showing a one stop speed increase. Development times typically 2-3 minutes. If you decide to use this, I would appreciate feedback of your experience with this formulation.