Oh no, maybe I did not express that clearly enough: I dilute Perceptol 1:1 or 1:2 and use this working solution one shot. But since itīs a powder it has to be dissolved to create a stock solution first, that was what I meant. I do not develop film in this stock solution (though that would be possible). No intention to switch to another developer either! What PE said makes sense to me. I wonīt put the film back into the fridge again.