RE: Dark reaction of gum coating
Thanks to everyone that commented about DR. A couple of weeks ago I coated two sheets with the same pigment-gum-dichromate mixture and deliberately placed them inside a metal cabinet and left them over night. So about 12 hours later I coated two fresh sheets the same way and then exposed all 4 sheets with a step tablet within a 20 minute period. I got virtually identical results with all 4 step tablets. The RH was over 60 and temp was about 75F during the whole period of dark storage. I was a bit surprised that prints showed no effect of DR. So I'm not denying DR occurs, I just haven't seen it. Thus I just don't see how coating a few sheets together in a batch and exposing and processing within an hour or so can make much difference regardless of the environmental conditions, which is what I do frequently. And I don't consider my coating and processing technique to be sloppy as I aim for consistency since I'm printing with digital negatives. I suppose everyone's mileage varies as they say, Don
|