I have been asked to help develop 4x5 B&W film for a college alternative processes class of 13 students and me with my Jobo CPP-2 and one Expert tank. I have used Bostick & Sullivan’s Rollo Pyro for the last five years for silver, platinum and vandyke printing. The school uses Sprint darkroom chemicals for price and safety. Can Sprint handle the aeration of a Jobo? The Rollo Pyro has a cancer causing powder in the prewash that parents might object to or sue me for using near their babies.
The negatives will be used for UV printing in both Vandyke and Cyanotype printing so I will need extra contrast.
I have established my film exposure, developing time and temperature through trail and error. How do you do that with students who are using a 4x5 for the first time and probably different film brands and speeds?
Is there anything else I should worry about?
John
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