SENT TOO SOON!!! Let's try this again!
DEAR KEN & TIM,
Way back from the mid 70s until I sold my NYC studio and moved to Barbados in
93, I had a 3 1/2 gallon D-76 processing line in a separate film darkroom. I
had a careful replenishment regimen. As I went through, literally, hundreds
(and over 1000 some years) of rolls of b&w film (and many sheets of b&w 4X5) it
would have been very financially inefficient to use anything except a
replenished line. After the first few dozen rolls and replenishing, what was in
that tank was only D-76 in name as I am sure that things had radically changed
including build up of bromide ions and exhausted dev agents. But the results
got better with age so neither I nor my clients complained.
One place I was quite careful was with print dev. If it hit the tray, it was
NEVER saved to be reused to make prints. If is was barely used, a very few
times I might have saved some to make contact sheets.
Anywhom, replenishing can work.
CHEERS!
BOB
From: "Ken Hart" <kwhart1@xxxxxxxxxxxx>
To: "pure-silver@xxxxxxxxxxxxx" <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, July 14, 2017 11:10:10 AM
Subject: [pure-silver] Re: Replentishing With New Developer
I never used replenisher with B&W chems- memories of my high school photography
teacher won't allow it!
But replenishment in C-41 is common for me. In the case of C41 Dev and fix, the
replenisher is the stock solution. However, to make working developer from
stock solution, you add developer starter. So in effect, there is a difference
between the working solution and the replenisher. With fixer, the replenisher
is the stock solution straight up.
For your question, I found this link: [
http://www.apug.org/forum/index.php?threads/dk-50-developer.62109/ ;|
http://www.apug.org/forum/index.php?threads/dk-50-developer.62109/ ] ;
About halfway down the page is this response: " DK50 and DK50-R Replenisher",
where the poster gives the formulas. I'm not into the actual chemistry, but
there are differences between the developer and replenisher. The replenisher
has 2X Kodak Elon Dev Agent (Metol), 4X Hydroquinone and Kodalk (Sodium
Metaborate), and no Potassium Bromide.
Ken Hart [ mailto:kwhart1@xxxxxxxxxxxx ;| kwhart1@xxxxxxxxxxxx ]
On 07/14/2017 10:45 AM, Tim Daneliuk wrote:
When dealing with D-76 or DK-50, is it really urgent that one use the
replentisher chemistry? Why can't I just use fresh devloper (at the same
dilution) and top up the working developer with, say, 1oz of fresh dev
every use?
