T-Max and Tmax RS Developer was formulated to create a "liquid D-76".
Unlike most previous Kodak B&W developers that were formulated based on
experience and good luck T-MAX design used computer aided statistics in
addition to experience and good luck. The criteria included: speed,
fog, contrast (low, straight line, shoulder), grain, MTF at several
frequencies etc. After the performance was established similar studies
were done for pH, concentration and contamination sensitivities and as well
as concentrate and working strength keeping. It is a pretty good
formula in my very biased opinion. I am not surprised it is still good after
several years. That was in the design.
RS
www.makingkodakfilm.com
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Robert Shanebrook - Kodak Film - Photography - Photographic Film Manufac...
Book: Making KODAK Film , The Illustrated Story of State-of-the-Art
Photographic Film Manufacturing by Robert...
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On Monday, February 22, 2021, 09:52:52 AM EST, Laurence Cuffe
<dmarc-noreply@xxxxxxxxxxxxx> wrote:
Hi Tim,
I found an opened bottle of this from about ten years ago in my darkroom, I had
used about 1/8th of it before I screwed the top back on ten years ago. I used
it last week, and to my total surprise it was fine. Given lockdown, I find
myself trundling through all sorts of old bottles and boxes of photographic
supplies, and its been interesting. I found a box with about twenty sheets of
sheet film, labelled exposed, undeveloped, which has been a total adventure,
there is a lot of prising sheets which have stuck together apart going on, but
its fun. I think I used the TMAX on some of these.
To paraphrase a response I found while googling some obscure lens from the
back of a cupboard, “Stop asking random starters for information, ask the
developer!” So just test it, all you have to loose is thirty minutes of your
time, which you were going to spend online any way.
Best regards,
Laurence Cuffe.
On 22 Feb 2021, at 01:53, Tim Daneliuk <tundra@xxxxxxxxxxxxxx> wrote:
I found a couple of unopened bottles of TMAX RS liquid developer from ...
1997ish.
Should I toss them or is the sealed bottle still good?
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