----- Original Message ----- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx> To: <pure-silver@xxxxxxxxxxxxx> Sent: Tuesday, October 19, 2004 6:18 AM Subject: [pure-silver] Re: Polycontrast Paper Performance / Cold lite > Kodak published a formula for a variable contrast paper > developer, D-64. This > was said to give a certain amount of contrast control for > a single paper grade. > There is also a formula from Adox, E-15. This technique > fell out of use when > variable contrast papers became widely available. The > contrast range that these > formulas provided was probably about 1 paper grade or > less. > > Jerry > FWIW, here is Kodak D-64 Stock Solution No.1 Water (at 125F or 52C) 500.0 ml Metol 4.7 grams Sodium Sulfite, dessicated 33.8 grams Hydroquinone 5.2 grams Sodium Carbonate, anhydrous 26.9 grams (if monohydrated use 31.5 grams) Potassium Bromide 2.4 grams Water to make 1.0 liter Stock Solution No.2 Water (at 125F or 52C) 500.0 ml Sodium sulfite, dessicated 33.8 grams Hydroquinone 19.2 grams Sodium carbonate, anhydrous 26.9 grams (if monohydrated use 31.5 grams) Potassium Bromide 2.4 grams Water to make 1.0 liter For use dilute at follows: A, Soft Stock Solution No.1 360.0 ml Water 600.0 ml B, Medium Stock Solution No.1 180.0 ml Stock Solution No.2 180.0 ml Water 600.0 ml C, Hard Stock Solution No.1 180.0 ml Stock Solution No.2 360.0 ml Water 420.0 ml To each liter of working solution developer add 4.0 ml of 10% Potassium Bromide solution. More bromide may be added for warmer tones. Develop for not less than 1.5 minutes @ 70F (21C) This is evidently a modification of a developer devised by Beers. I may have a reference to the original. Actually, I think I have the formulas somewhere. Ansco/Agfa suggested a two tray method of variable contrast development. The two developers are Ansco/Agfa 120 for the low contrast bath and either 130 or 125 for the high contrast bath. 125 is somewhat less active than Kodak D-72/Dektol. A more active developer for the second bath is either Agfa/Ansco 103 or Kodak D-73. Agfa 103 is virtually identical to Kodak D-72/Dektol. An even more active developer is Kodak D-73, billed as a cold tone developer for Azo and similar papers. Kodak D-73 for Blue-Black Tones on Paper Water (at 125F or 52C) 500.0 ml Metol 2.8 grams Sodium Sulfite, dessicated 40.0 grams Hydroquinone 10.8 grams Sodium Carbonate, anhydrous 75.0 grams (if monohydrated use 87.5 grams) Potassium Bromide 0.8 grams Water to make 1.0 liter For use dilute 1 part stock to 2 parts water. The two baths are used successively. I believe that Ansel Adams used something similar. I doubt that these variable contrast developers really have much effect on the paper contrast. It would be interesting for someone with a reflection densitometer (I have not) to actually test this out. --- 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.