Response to 4x5 B+W Blotchy Marks on Some Negs: Why? Help Please!

Two thoughts (admittedly longshots) come to mind. Is all the film from the same box or batch? It's possible you've got a bad batch. The other thing to check is fixing. Is it absolutely certain that this is a density problem on the emulsion side? What's the total processing time? Naturally, short development times can cause trouble, but I suspect you already know that. A bunch of narrow blotches closely spaced together also could be some type of storage problem, pre or post exposure, rather than processing. Hope you get lots of input, as this might be a tough one!

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