Response to Can someone identify the processing error ?

I own a Black & white lab and have seen this problem. A rotary tube processor like the Jobo will show this pattern if the cap is not on correct. The rotation will cause the sprocket pattern in the uneven way you have described. Also a rack and hanger machine, with it's up and down motion will show a pattern if there is a light leak fron an angle. I inititally agreed with the over agitation comments but after you clarified about the pattern, it does sound like a rotary tube processor cap leak.

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