PMK/JOBO

I have no experience with JOBO, but I can perhaps address your concerns on PMK oxidizing. Mix your developer just before you use it, say while your film is in pre-wet. Use distilled water because iron and other impurities will affect the solution. If your tank is sufficeintly full, oxidation should not be a concern. I develop sheet film by hand in trays and have not had a problem with oxidation.

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