I have just started using LPD paper developer and am very pleased. A slightly wa rm tone and I think brighter whites than I was getting with Ilford MG. I know th is developer is supposed to last much longer at working strength than most. I us e it for a few hours each night and then return it to a container. How will I kn ow when it is depleted? I know I can run a time test to full black but wonder if that is the best. Will there be any other noticable changes in the print that I should watch for?
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