[pure-silver] Re: film capacity of stock D-76
- From: Bogdan Karasek <BKarasek@xxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 01 Feb 2012 13:53:37 -0500
Hello,
Thanks for all information... More than enough for what I am doing
today but I will archive it for future use. See below:
On 01/02/2012 10:28 AM, Tim Daneliuk wrote:
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
If I take this starting figure of 16 8x10s/L of D-76
I have 13L of stock D-76 in my tank right now, more than enough to do
the 18 4x5s and 4 6.5x8.5 which the equivalent of around 9 8x10s, so,
counting yesterday's 20 8x10s I put through the 13L tank, I will have
put the equivalent of around 30 8x10s though 13L by the end of the
day. So I'm still good to do today's. I'll save the higher math
for another time. From now on, I'll be doing max 4-6 8x10s at a time.
Again, thanks everybody... you are a fount of information.
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.
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