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What is the difference between Tri-X and Tri-X Professional?

from Sol Campbell (solcam31@hotmail.com)
In 120 roll film, I can get either standard Tri-X or "Professional" Tri-X. I noticed that the Pro Version is rated slightly slower at 320 than 400.

But what really is the difference between the two? Or are they really the same emulsion? Like Astia is Sensia II.

(posted 8659 days ago)

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