Okay, here's the thing... I've asked a couple of photo labs to cross process my E6 slide film in C-41 chemistry, and they all claim it will "ruin the machines". I've also talked to my sister who claims someone did it at a photo lab she worked in and they had to clean out the entire machine which involved a lot of time and hassle. Will I have to start home-processing my film if I want to do this? Or should I keep asking around? How do any of you who use this technique do it? I was hoping maybe the lab could just do it right before they throw out the used up chemicals and put in new stuff, but no luck with that angle so far.