Thanks for your comments Yorkie and interneg. The more I think about this situation, the more I think it is operator error (me). If I missed a couple of the bottom retaining tabs on the SP-445 negative holder it could easily have stuck part of the emulsion to the inside of the SP-445 tank and during development, the emulsion wouldn't develop. If, subsequently, the emulsion released from the frame, the fixer would then clear it away, leaving this result. I just need to slow down and be more careful when loading my exposed film into the SP-445. In fact, I'm now prepared to blame my wife. She started talking to me while I was loading the SP-445 - distractions galore
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