Developed in RO9 but it is not the developer. |
When
something unexpected happens while you are processing your
negatives, it takes a bit of time to get your head round it. This
happened while I was processing a number of rolls of film in R09 and
using it's special brother.
The
problem has shown it's self by producing very blotchy negatives
affecting two rolls of the six film developed. When this happens in a
run of developing it is difficult to work out what circumstances are
different enough to point a finger at.
Please
bear in mind that the elimination process was written after I
discovered the culprit.
Fomapan 100 negatives developed in RO9 |
Process
of elimination:
- So where to start? It is fortunate that the negatives involved were not the ones processed in the RO9 special. The RO9 developed one's were. This made the investigation more straight forward in that I have a better understanding of how RO9 works.
- Was it the developer? It was made up seconds before it was used in the usual way.
- What about Stop and Fix? Both were freshly made up minuets before use. So it cannot be one of the three main players? As they are all fresh.
- OK what about the method? No difference there either I used my usual inversion sequence.
- Processing tanks? Well I did press a tank into use that I have not used in a long time because of the quantity of film that needed to be developed.
- Could that be the answer?
- Did it affect one make of film in particular? No it did not, again this could have been a fortunate coincidence in that a roll of FP4+ and Fomapan 100 show the same affect. If it had only happened to one make it could have been construed as a manufacturing fault.
- Water? It was fresh and clean and there had not been any notices to say there was a problem with the drinking water.
- That leaves wetting agent? Hold on now that points to something I noticed when I was using PMK Pyro some years ago, I had a roll of film with the same sort of pattern. I put it down to the developer which I have
Film FP4+ developed in PMK Pyro
Looking
back I think when I pressed the other developing tank into use I
mistakenly picked up the one I had been using for wetting agent. The
resulting blotchy pattern is the result of its contamination.
This print was made from the same contaminated Negatives. note no blotchy marks. |
Conclusion:
Having
eliminated all the other possibilities and no matter how silly it may
sound the wetting agent is the culprit in this case. It has this time
affected nearly all the frames on each film, when it happened some
years ago (after checking the negatives) only certain frames showed
signs of being blotchy. Which would indicate a weak contamination of
the film process. This is only the second time I have had this
problem in all the years I have been developing film. It just goes to
show that something as innocuous as soap can cause so much trouble if
it is not washed away conclusively after every processing session
when added to the developing tank. My suggestion is to put wetting
agent in a separate container and add the reel and film to it and
not the other way round.
This picture shows that the blotches are prominent In the sky but not the foreground. |
When
printing the affected negatives you cannot see the blotches when
looking down the focus finder. Even though the contact prints show it
quite clearly.
All
the photographs that appear with this article were printed from the
dodgy neg's. As I mentioned not all suffered the soapy demise.