Richard, we're both right (but I'm more right :) AA omitted the Hydroq and the bromide restrainer in the primary solution . He made a separate solution for the HQ that he'd add to achieve higher contrast, when needed. His modified A130 had no HQ, no KBr restrainer, and reduced sulfite in the primary solution. I'm reading from his "The Print" p. 114. Jim ----- Original Message ----- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx> To: <pure-silver@xxxxxxxxxxxxx> Sent: Monday, October 18, 2004 5:45 PM Subject: [pure-silver] Re: Polycontrast Paper Performance / Cold lite > > ----- Original Message ----- > From: "J.R. Stewart" <jrstewart@xxxxxxxxxxxx> > To: <pure-silver@xxxxxxxxxxxxx> > Sent: Monday, October 18, 2004 11:06 AM > Subject: [pure-silver] Re: Polycontrast Paper Performance / > Cold lite > > >> Remind me, Ralph, please: "factor of factorial >> development"? And why does it >> apply only to fiber based paper? I don't recall seeing >> that described >> anywhere... (not in your book is it??--if so just tell me >> and I'll find >> it.). >> >> In a related post I made this morning, I reported a >> significant difference >> between Ansco 120 and Anso 130M on the same paper. I >> wonder if the small >> differences in paper response apply to developers of the >> same class, e.g. MQ >> developers. Ansco 130 replaces HQ with glycin. It really >> has a longer scale >> in my hands. It may also be due to my use of benzo as a >> restrainer in my >> paper developers instead of Na bromide. Don't know. >> >> Jim > > Agfa/Ansco 130 does not replace MQ with Glycin but adds > Glycin in addition to MQ. Without the Glycin it is very > similar to Dektol or to Agfa 125, which was the Ansco/Agfa > equivalent of Kodak D-72 or Dektol. > Here are the two formulas for comparison. > > Kodak D-72 Stock Solution (Identical to Dektol) > > Water (at 125F or 52C) 500.0 ml > Metol 3.1 grams > Sodium Sulfite, dessicated 45.0 grams > Hydroquinone 12.0 grams > Sodium carbonate, monohydrated 79.0 grams > Potassium bromide 1.9 grams > Water to make 1.0 liter > > Kodak recommended dilution per the material being developed, > varying from 1:1 to 1:4. 1:2 is about right for most > materials but capacity is greater at 1:1 > > > Agfa/Ansco 130 Universal Paper Developer Stock Solution > > Water (at 125F or 52C) 750.0 ml > Metol 2.2 grams > Sodium sulfite, dessicated 50.0 grams > Hydroquinone 11.0 grams > Sodium carbonate, monohydrated 78.0 grams > Potassium bromide 5.5 grams > Glycin 11.0 grams > Water to make 1.0 liter > > Agfa recommended using the developer at 1:1 but stated that > it could be used from full strength to 1:2 > > Ansel Adams modification was to add Benzotriazole to the > above and reduce the amount of bromide. He did this to > affect the image color. Adams wanted neutral or slightly > cold (blue) image color and found that Dektol gave him > slightly olive (green) tones with many papers. Developers > like Dektol or D-72 will do this on some papers especially > when used for a time, perhaps because of the increase in > bromide. Benzotriazole tends toward neutral or cold tones so > replacing some or all of the bromide in a developer will > shift the image color somewhat, just as in increasing > bromide content will tend toward warmer tones. > The presense of Glycin in 130 may also have an effect on > image color but I am not certain in which direction it > tends. > From the formulas it appears that one could make > something close to Agfa 130 from Dektol by adding Glycin and > some additional bromide to the mixed stock. > Glycin is added last because it dissolves better in > alkaline solutions. > > --- > Richard Knoppow > Los Angeles, CA, USA > dickburk@xxxxxxxxxxxxx > > ============================================================================================================= > To unsubscribe from this list, go to www.freelists.org and logon to your > account (the same e-mail address and password you set-up when you > subscribed,) and unsubscribe from there. ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.