Fompan R100 Reversal First Developer
Thought I would share this, since I found info on a good working first developer for Fomapan R100 impossible to come by, since we had some to process for a customer, I had to come up with a working developer.
First off, any formulation using a solvent like sodium thiosulphate or thiocyanate, forget it, take it out. You can't use a solvent to clear the highlights on Fomapan R100, it will simply give you muddy dMax at best, you need no reduction of dMax through any significant solvent action, it isn't like T-Max and others that get reversed and work well with a solvent. You'll get muddy slides. You need to clear the highlights instead, through developing power.
This is basically modified D-19, less sulphite, more hydroquinone.
|Sodium Carbonate (anhydrous)
Dilute 1:3, and process for 5 minutes at 27 degrees celsius, initial agitation first 30 seconds, 2 inversions per minute after.
Use a stop bath, not a wash/rinse after first developer, all tests were done with stop, to eliminate differences in different tap water and continued shadow development (reduction of shadow dMax) of different pH values etc.
Wash/rinse after stop for 1 minute. You may then process this as reversal as normal and bleach from there.
I use a potassium dichromate and sulphuric acid bleach because it is reliable, I have nothing but trouble with permanganate bleaches.
Australians: I've tried bisulphate in place of sulphuric acid before, and it failed me, it looks like it had some small amount of some kind of halide salts in it and formed a partial rehalogenating bleach.
You may get concentrated sulphuric acid in Australia from anpros (google it) shipped to you, for what you get it's not expensive for how long it will last. Not sure how much interstate shipping will be, I was pretty close to the place, so I may have gotten a less expensive hazard shipping fee. There may be other places that do this too. Also you only need a few drops of it since it's concentrated in your bleach, and be careful handling it!