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Can I develop TMax and Tri-X TOGETHER ??

Liz Martini , Feb 18, 2011; 09:00 p.m.

Okay, be gentle with me if this is a really stupid question, but I can't find an answer in the forum.
I shot two rolls of 400 ISO B&W film, was about to spool them up together to put them in the same tank to develop with TMax developer. Then I realize that one roll is TMax, the other Tri-X. The prescribed time for each are really within about 45 seconds of each other so I was wondering what would happen if I did them together? I would do the median time.
Some darkroom veteran out there must have the answer...
{Oh, and I have only developed film in on my own about a dozen times, so speak slowly..}


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Robert Marvin , Feb 18, 2011; 09:25 p.m.

If the development times are so close, just average them and you'll be fine.

Liz Martini , Feb 18, 2011; 09:28 p.m.

Thanks, Robert, for such a quick response. I am itching to develop these.

Larry Dressler , Feb 18, 2011; 10:22 p.m.

But fix longer as the tmax needs longer fixing than the tri-X.

Bruce Karnopp , Feb 18, 2011; 11:31 p.m.

If you use Diafine Developer, you can develop any film together with another film. But you have to use different ISO numbers when you shoot the films.

Larry Dressler , Feb 18, 2011; 11:35 p.m.

Diafine gives a speed loss with Tmax and a gain with Tri-X. So as to get Bruce clarified there.

Mike Gammill , Feb 19, 2011; 09:41 a.m.

I think Kodak's HC110 dilution B might be what you're looking for. I've noticed that many black & white films have the same dilution B times in HC110 at that dilution. You could use the Massive Developing Chart as a starting point, but an ideal situation would be to conduct your own test before developing anything important.
BTW, if you only do film occasionally, HC110 is a great developer as the liquid concentrate has a long shelf life (longer than TMAX developer and unsurpassed in life by any other developer except Rodinal).

Jay De Fehr , Feb 19, 2011; 09:21 p.m.

I've had some surprises developing T-grain films with K-grain films. I suspect it has to do with the iodide in the T-grain emulsions, the same thing that makes them so tough to fix, acting as a restrainer for the K-grain films. If your TX comes out looking thinner than expected, this might be an explanation. Good luck!

Lex Jenkins , Feb 20, 2011; 01:51 a.m.

I noticed issues similar to what Jay described when I mixed T-Max films with other films in the same tank. No catastrophic failures, just some unexpected results. I might occasionally mix other types of films together for developing in Diafine, but I'd usually develop T-Max films only with T-Max films.

I'd also prepare separate batches of fixer: one for use only with T-Max films (which exhaust rapid fixer more quickly); one for all other films; one for print fixing.

Liz Martini , Feb 20, 2011; 02:56 a.m.

Thanks for all the information. I processed the film last night together, and they appear pretty much normal. Well, at least the TMax seemed normal since I have scanned that more than anything. The Tri-X has a lot more contrast and grain, and some shots that depended on more subtle tones really suffered. I will have to admit that I am not much of a fan of the Tri-X, but have been influenced by other photographer's ravings. May be I am just a tabular grain kind of gal...
I think in the future I won't mix the two. These weren't crucial rolls, but it will keep me forever wondering....Was it too much agitation? bad exposures? reaction of being with the TMax? Or just the nature of Tri-X?
Tri-X shot on Flickr -- grainy, and hard to retain detail in the beard:

TMax shot on Flickr -- much better tonality:

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