Auteur: Georges Giralt
Date: 27-02-2008 14:07
Je ne résiste pas à l'envie de publier ici la formule de Donald Qualls sur APUG pour un substitut du Rodinal basé sur .... le Paracetamol.
"Here's another Rodinal Substitute you guys can try: acetaminophen, aka paracetamol. It converts to para-aminophenol in a strongly alkaline hydroxide solution; a little sulfite preserves it. A recent thread on f295 includes images scanned from film developed in this stuff: http://f295.tompersinger.com/cgi-bin...b,m=1132019056
The formula used was:
50 ml water
3 g acetaminophen (6 tablets, 500 mg size, crushed)
4 g sodium hydroxide (Red Devil Lye)
10 g sodium sulfite anhydrous
According to original article, dilute 1+39, use like Rodinal 1+25 (which makes it equivalent to R-09). Based on Daryl's results, I'd suggest trying same concentration as Rodinal.
This is quite close to Gainer's simple Rodinal substitute -- a little more sulfite, but otherwise very similar. The acetyl group cleaved off the acetaminophen is only about 5% of the molecular weight, and of course one could adjust the proportions if needed to control the developing characteristics, but I'm certainly planning to try this. BTW, the amount above is enough to develop 8 rolls of 35 mm at 1:25, or 32 rolls at 1:100..."