I don't know about Perceptol, but following Ilfords suggestion, with D76/idii with stock they said develop forst film at ilfords suggestion, then add 10% per film up to 90% for the 10th film, with perceptol it is suggested that 4 films per litre of stock can be developed by adding 10% to the time per film, that is develop first film for the suggested time than add 10,20,30% per film, pouring the used developer back into the bottle of stock, these times are for litre
Richard
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