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TMY to TMY-2... when?

Darkroom: Film, Processing & Printing - www.largeformatphotography.info
People who know my history will laugh at my ignorance. Go ahead; here's my question.

When did Kodak change T-Max 400 to it current formulation?

I tested the original in '87 or so. We occasionally had use for it on the job, but I never used it for personal work. I do remember that it was big news when they improved the emulsion... but wasn't tempted to try it then.

Now someone has given me several boxes of 4x5 TMY, dated 12/2009, emulsion #561.

No one I know from my Kodak days still works there, so I'll put my question to the community; is this film the original version or the new and improved?

I've loaded holders for EI/dev time tests, so will find a working method for this film, but it would be interesting to know the answer.


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