I understand what you're saying, Dan. my reference to 10 seconds was really just an approximation meant to show that it was before the complete fix cycle had finished. It was probably closer to 30 seconds, and it was really no different than the process I've used over and over again. I've seen fogging from switching the lights on too early and from flashing paper and it's a grey tone (as one would expect). This is decidedly yellow staining. I think it was more a contamination problem than anything else. I'll be sure to use an acid stop, even with TF4, and limit the spill over of developer.