Thanks for the replies everyone. I can't imagine what went wrong with this sheet. It's difficult to imagine that its a factory defect as it was on the opposite side of the holder that produced the good negative. That means that it was immediately adjacent to the good negative in the box. I first thought that it had fallen from the production line and exposed and then put back with the run. But that is highly improbable. More likely I made a mistake somewhere but i don't see how as my routine is unvarying: after composing on the GG I remove the DC and insert the holder. Then I determine the exposure, close the shutter and dial it in, and always trip the shutter at least once or twice before the final cock, and only then remove the DS. Because of the Compur "B" issue I recently switched to using a short cable release with the 8x10 so that I can clearly hear the shutter operate and was standing next to the lens when I tripped the shutter. Somewhere, though, it got a lot of light.
Thomas
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