Thank you for the compliment. I'll add that the nitrogen-burst agitation in these 40-inch deep tanks is pretty aggressive at 8 second burst then 8 seconds pause. I did a lot of tests after having mottling in sky zones 7-8 that settled on those agitation numbers with HP-5. Except for this seemingly random intermittent flaw on thousands of sheets of film, the development seems perfect for my purposes in density and contrast and the rebate is clear so I'd rather chase a hardware flaw first before I tinker with development/agitation times.
And I have chosen samples that show the most extreme density change and not the ones where there is no density change.
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