I haven't developed prints in a Jobo drum in a very long time. I'd like to develop some 8x10 Ilford RC paper negatives in a 2830 drum in with a CPP-2 + Lift. I'll just develop one sheet at a time. With film, the reels are loaded with a plastic tube core, and that core fits onto the Jobo top. Does one need to use one of these black cores when developing prints to keep the drum light tight? I can't seem to find the info in any of the manuals.
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