So why does the bleach work with Dektol then? Ive kept all parameters the same - except the developer.
FD can't have an effect that is hidden throughout and surfaces only during second development. If FD did anything abnormal, it would have been visible to OP after bleaching/clearing. But IIRC OP said he checked and found the roll to be fine after the clearing step.
Nevertheless, it is best to check with @ADOX Fotoimpex about the compatibility of Adox MCC developer with reversal first development.
Someone pointed out that chloride ion in the bleach could cause something like this. Could bromide carried over from first dev into the bleach do it? I don't know what's in MCC, but some print developers include a significant amount of potassium bromide as a restrainer.
@Raghu Kuvempunagar , I did check after clearing. There is a chance I should have checked better, but my impression was that everything was ok.
@Alessandro Serrao , its unclear to me what you mean is wrong with the bleach. I havent read the Unblinking Eye article yet, but after having a look its my impression that the issue is related to permanganate bleach only.
I also wonder why the bleach is to blame when it works fine with Dektol and PQ. Does that mean that its strong enough for those developers, but to weak for MCC?
What you've read in the Unblinkingeye page is about permanganate bleach but dichromate bleach works the same.
This depends though - doesnt it? When the exact same bleach works just fine with Dektol and PQ (even after failing with MCC twice).The problem is the bleach, not the developer.
I would expect this to be too weak considering PQ is mixed 1+5 instead of 1+9, and Dektol 1+1 instead of 1+2. Both for 14 minutes with thiocyanate (2.5g/L).Make a fresh new bleach batch and retry with Adox MCC 1+4 (1+1 is overkill), with some thiocyanate in it, not exceeding 12min developing time, otherwise you'll start losing DMax.
I don't really see how a failed 1st dev or bleach would explain a transparent perforation area.
I don't really see how a failed 1st dev or bleach would explain a transparent perforation area.
PS This is my bleach working solution:
100 ml 10 % dichromat solution
25 ml 50 % sulfuric acid
875 ml water (distilled)
This is the standard Kodak bleach - there shouldn't be any problems.
but the bleach can be exhausted
It's not addressed, with all limitation that can imply a forum discussion, first of all.It cleared a fully developed, dense leader in seconds. It's evidently not exhausted.
All questions and suggestions you've been bringing up were addressed on the first page of this thread. Please take a moment to read what was already discussed back then.
Yup. For that reason I'd suggest to do another A/B test with the MCC developer and Dektol, but this time use optical fogging instead of chemical fogging. The image-wise evidence points in the direction of failure of the fogging step.I don't really see how a failed 1st dev or bleach would explain a transparent perforation area.
I don't know exactly how the stripping process works, but I assume that eventually the buildup of silver sulfate will deplete the sulfate ions.
As said, theres no indication here of the bleach running out of steam.
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