Hi. Perceptol is not suitable developer for such a fast film as TMZ. It gives very fine grain but there is some loss of sensitiviy. You can try todownrate it 1-2 stops and experiment, but I will strongly advise you to swich to T-Max, HC-110 or X-tol developers. From ILFORD you can use ILFOTEC, ID-11 or MICROPHEN. Evgeni(posted 9399 days ago)