Although I no longer have my old copies of Practical Photography magazines, I can recall when they reviewed several different B&W film developers by shooting several rolls of Ilford FP4 35mm film and then developing each roll in the various processing solutions. My memory is a little sketchy here and some of you might have read the particular magazine (publishing date/year long forgotten). I seem to remember that the films were then sent to a laboratory so that each negative to developer combination was photographed using a 35mm Camera loaded with a slow Tungsten balanced colour reversal film which was attached to a microscope. Each image represented an enlargement of around 36-40X magnification or there abouts. A guy by the name of Mike Buxton did this stage of the work. I remember that Agfa Rodinal yielded the grainiest of the negatives while the finest grain was with Ilford Perceptol. Does anyone know which issue and year that this magazine issue was? Cheers, Keith.