Dear Esther, Are you using permanganate bleach or potassium dichromate (R9)? Pip Chodorov
> On Sep 6, 2021, at 9:42 PM, Esther Laurent-Baroux > <[email protected]> wrote: > > > We regularly have problems with C4 : the films often come out gray, with > little contrast, and with kinds of white spots, especially in the blacks. > I wondered if other labs had the same kind of problems, and if this is due to > the collective management of chemicals and their production. >
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