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Originally Posted by chris_livsey
Thank you exactly what I was after.
BTW is it true that Kodak SuperXX became TriX when the "speed" was changed without an emulsion change ?
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This
Kodak's Venerable TRI-X Black-and-White Film Celebrates 50 Years says Tri-X was a new emulsion when launched in 1954 at ASA 200. Presumably that included the extra 1-stop safety margin, hence ISO 400 in today's terms, although the article isn't clear.
Wikipedia has a short Tri-X article but it's confused to the point of uselessness except for including the link above
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