Admittedly, I haven't used a lot of this material so take this for what it's worth. My main concern when using this stuff is to control the contrast to a point where it can be used as an enlarged negative for cyanotypes. More contrast is needed for this printing process than is required of silver papers, but not as much you'd need to make a half tone screen. Speed of processing isn't an issue for me, and if it takes 5 minutes to fully develop the film, so be it. To that end, I've tried Dektol at the strength I use for silver papers. Not good. Too fast and too contrasty. Tried the same at 1+9. Still too fast. Then I tried HC-110 at 1+63. Now I was on to something. It was still fast, but the contrast was coming under control. In fact it was good enough to make an enlarged positive that stood up well to a back lit display or projection. Still too much contrast to bring it to the next step, which would be making an internegative by means of a contact print. My next round experiments with this stuff will try even higher dilutions of HC-110 at 1+100 and Rodinal at 1+100. Processing can be done in trays, by inspection, under a red safelight. OC and OA safelights are not good.