development time formula

greenspun.com : LUSENET : B&W Photo - Film & Processing : One Thread

I remember a formula for development times in an old publication but I can't remember the name of the book. Several of the film types were assigned a guide number and the the unknowns were temperature and developer. Where can I obtain this formula?

-- Dan Johnson (goddoot01@bellsouth.net), February 25, 1999

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