On 02/01/2012 09:14 AM, Eric Nelson wrote:
I'd do some kind of replenishment with that kind of system. That way you can keep processing without worry. Seems Kodak discontinued d-76-r so you'd have to find out the formula from them or somewhere. i snagged the last few bags i could find of them online and i'll bet there's none now. ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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*From:* Bogdan <bkarasek@xxxxxxxxxxxx> *To:* pure-silver@xxxxxxxxxxxxx *Sent:* Wednesday, February 1, 2012 5:56 AM *Subject:* [pure-silver] film capacity of stock D-76 Hello all, I've done a Google search and can't find a satisfactory answer. Yesterday, I developed 20 8x10 sheets of Tri-x 320 (iso 200) in a stock solution of D-76 using a 3.5 gal tank and film holders (a first... used to do the tray card shuffle). I have 16 4x5 sheets of Efke PL 25 Ortho and 4 sheets of 6.5x8.5 sheets of T-max that I want to develop today. Question is, can I continue using the same tankful of D-76 or is it exhausted and do I have to prepare a new batch 0f D-76 to do the Efke and T-max? Cheers, Bogdan K
Kodak says the capacity is 16 8x10s/liter of developer However, if you replentish, you can extend this considerably. I do this by mixing two gallons of D-76. One is my working developer, the other my "replentisher" - Kodak did/does make a D-76R for this purpose, but I never bothered. I keep the replentisher in a cubtainer so that as I use it, the remainder is not exposed to air. There are a number of ways to determine how much replentisher to use, but I use the lazy man's way: After each development sessions, I fill the working D-76 gallon back up to the rim of its container with fresh D-76 from the cubetainer. Using this method I have gotten around of year of useful life out of a gallon of D-76. HOWEVER ... I typically only do 3-4 8x10 equivalents at a time. Given the volume you're doing you may want to be more aggressive in replacing the old developer with the new. You might start with something like 1oz of fresh D-76 for each 8x10 equivalents. Pour that into the working container first, and then fill it back up to the rim with working developer when you're done. You'll likely end up with left over working developer in the tank doing things this way, which you can just toss out. I don't think this is super critical so long as you are regularly adding fresh developer to the working solution. -- ----------------------------------------------------------------------- Tim Daneliuk ============================================================================================================= 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.