I just bought the Dick Arentz book "Platinum & Palladium Printing." He has a cha pter on film processing. He himself seems to lean toward tray processing, becaus e he useses an unusually large film size. I am just getting started with 4X5 and am considering tray processing for the advantages gained by not being tied to c onstant agitation. In his description of agitation he recommends lifting the fil m completely out of the developer at regular intervals. Isn't bringing the wet f ilm into contact with the air that often likely to cause problems? I would have thought you would want to keep the film submerged as much as possible. thanks - ----JimJ
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