Originally Posted by Francesco
You might have mixed the working solution using only either Part A or Part B. If you did the result would be a piece of blank film.
It happened with me more than once. I got confused with the white/black labes of the slide. So during my development session (I normally develop 4 negatives at once) I thought the film holder had 2 exposed negatives. It had only one.
It is possible that I did as you say. It has been a tiring day. Hiked more than 5 km with my pack (20 kilos) and the exhaustion extended itself all the way to my brain. I will never know for sure. I can only try once more with a bit more care.
At least I am comforted by the fact that because it is not black I can be confident that my equipment (holders, bellows, changing tent, tubes) is defective in some way that light leaks in.
That is supposed to read: "I can be confident that my equipment is NOT defective in some way...."
[quote="Jorge Oliveira"]Or a dead developer.
That has happened with Xtol (and with a crazy mix I made...) - sudden death.
I have heard of this happening with Xtol. And when it happens you apparently have no clue because there is no discoloration of the developer.
Pyrocat-HD (and PMK) are not subject to this kind of sudden death. Whe Pyrocat-HD goes bad the clear Stock A solution turns dark brown (Stock B has an indefinite life). This has only happened to me once and when it did the developer was over 2.5 years old and was being stored in a 250ml bottle that was less than 1/2 full. In fact, it was a test stock that I deliberately left just to see how long it would last.
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Just get a small piece of unexposed film or paper and develop it in a tray in roomlight.
If it gets black in your normal dev time, the dev is OK and you made some mistake.
I was trying to make a longer lasting Xtol equivalent (the standard formula works quite well).
I split it in two solutions - dev and alkali, and added (a lot) of boric acid to the dev so it would become slightly acid.
So far, so good.
In the same week;
- did a black leader test - OK
- did a short strip test - OK
- shot half a 35mm roll - Ok
- shot the rest of the roll - almost clear...:evil:
Recheked with a leader test - clear.
My conclusion - there is somenting (impurities) in boric acid that kills ascorbic acid.
Thanks for the replies. I will be developing tonight and will try your suggestions. I will also pay extra attention to the A and B markings on the bottles (they still have a clear colour).