[QUOTE="laura halliday"]\nsnip\n\nShrug. My problem is not basic darkroom competence. It's the fact\nthat even if I print exactly the same negative with exactly the same\nexposure, colour filters, processing, etc., I rarely get the same\nresults.\n[/QUOTE]\n\nObviously, I didn't intend to degrade your darkroom skills; some people here\nare beginners and some are advanced-\- without badges, it's impossible to\ntell.\n\nIf you are doing everything the same, the results should be the same.\n\nHow is your enlarger power supply? Here, when the air conditioner comes on,\nthe lights dim, so before making color prints, I turn off the air\nconditioning. Also, I was taught that enlarger exposures should be in the\nten to twenty second range. Shorter than that is difficult to control,\nlonger and there is a chance for vibrations.\nAre you using dial-in filtration or individual filters? I use individual\nfilters, and I've found that just because two filters are labeled 20M,\ndoesn't mean they are both 20M. I numbered my filters, and always use the\nlowest numbers and least number of filters, so I'm likely to get the same\nfilters each time.\nWhat about the chemistry? Do you one-shot the chems or replenish? Is the\ntemperature control accurate? I use a roller transport system that\nautomaticaaly replenishs. It also holds 15 gallons of each chem and the\ntemperature is thermostatically controlled, so the temp stays pretty stable.