You must do what you think fit but I doubt if we have another "Kodak backing paper " issue here with Ilford but Ilford need to know and deserve to know what each complainant problem is and enough details so that it can look into its own QC reports.I was about to order 100' of Ilford 120 backing paper from the ULF Purchase Program... now, I don't know if I will...
I'll just re-emphasise what I posted in the other thread: none of the faults displayed are indicative of anything other than well known faults of 120 backing paper when exposed to significant & rapid temperature differences causing condensation or poor storage in humid conditions.
Hmmm .... I've been using a variety of Ilford films for several decades, in a wide range of formats, and have never run into a manufacturing glitch yet. Nor have I heard anyone else complaining prior to this. I have had a few minor issues with certain papers, affecting a few sheets per box. But you claim that ALL these various films have problems. If I was Sherlock Holmes, I'd strongly suspect the user rather than the product is at fault. So, despite your credentials, it might be wise to ask yourself if there has been any changes of routine that could be involved. Some of this mottling could be due to condensation; or it could very well be that some of your PMK solution A precipitated in the bottle during the cold of winter. I don't know. But blaming the manufacturer is the least logical answer, and frankly quite unfair to Ilford unless your allegation is proven credible. I'm not saying it's hypothetically impossible, just highly improbable. So you probably need to look somewhere in your own routine for the answer. But Pan F is a tad trickier than the others to develop evenly. Therefore, for PAN F 120 I use PMK 5:5:500 ml instead of the usual 5:10:500, and add just a drop or two of 1% EDTA to assist even flow. I also recommending exposure at ASA 25 and keeping "normal" development fairly short, like 6 or 7 min, depending on your agitation technique. But its symptom of squirrely development would be streaks. Mottling is something else.
But it sure looks like one...This is not a backing paper problem.
The coating defects I see generally fall down into two categories:I feel that it is happening during the coating process of the film base. The machines run thousands of rolls of film at a time, maybe tens of thousands. Only a small percentage of rolls are affected when the silver slurry becomes inconsistent and is applied unevenly to the film stock.
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