On occassion, I've encountered similar, puzzling markings on both Tri-X and Plus-X. The folks at the local camera and photography shop have suggested over-agitation during development as the possible culprit. Since then I have been a bit more conscientious about agitating, thus appearing to have corrected the problem.(posted 9560 days ago)Is there really a coorelation between over-agitation and streaking around the sprocket holes? Perhaps someone more learned can say.