Agfa 8, a Glycin based film developer
I recently received for evaluation from Bryant Laboratory, several grams of N-(4-Hydroxyphenyl)glycine: (C8H9NO3 : F.W. 167.16) CAS # 122-87-2. Task: Verify if it is indeed the developing reagent Glycin.
I completed the first tests of the N-(4-Hydroxyphenyl)glycine Sunday. It worked very well in the Agfa 8 film developer formulation. My conclusion is that it is the "Real Stuff."
Deionized Water @ 125 Deg F 750ml
Sodium Sulfite 12.5 grams
Glycin 2.0 grams
Potassium Carbonate 25 grams
Deionized Water to 1000ml
I exposed landscape subjects on 3 rolls of Kodak 400 TMY 120 roll film at EI 400 (bracketed exposures).
I developed the 3 rolls in small tanks at 71 Deg. F with minimal agitation (2 gentle torus inversions every minute). A deionized water rinse was given after development, followed by fixing in an alkaline non-hardening fixer.
I developed one roll in Agfa 8 for 11 minutes at 71 Deg. F.
The film developed cleanly, with excellent uniformity and showed very good tonal separation with fine grain and high image sharpness. I scanned the film at 4800dpi (optical) and made some 8x8 proofs. I also made 20X proofs of small sections of the negs. Grain was not evident at 20X.
I developed the 2 additional (duplicate) rolls of 400 TMY 120 (all 3 rolls - same emulsion #). I developed one roll in Pyrocat-HD (2:2:100). I developed the other roll in Pat Gainer's Phenidone/Vitamin C/Triethanolamine Developer (P-C-Tea).
Conclusions: Agfa 8 is a compensating developer. The results with Agfa 8/TMY compared favorably with the Pyrocat-HD/TMY and Gainer P-C-Tea/TMY results.
I used the Agfa 8 undiluted (I suspect that undiluted or at 1:1 or greater dilutions it would be a good Stand or Semi-Stand Developer).
The developer color was unchanged after 1 roll - so I saved it. I will test it periodically to assess its effective working life.
The Agfa 8/TMY combo performed so well that I will do additional testing to fine tune the exposure/development procedure. I will try it next on LF sheet film.
Tomorrow, I will use the remaining reagent to mix a stock solution of Ansco 130.