[LargeFormat] Printing the Giant Pinhole Negative: A Question

[Bob Younger]

Guy,
Are you using 'tap' water or distilled water? Could there be something in
the water that is causing the problem due to the long time to react? Maybe
run a few experiments with each.....

Bob Younger
San Diego, California, USA

But we encounterd a very weird
> reaction of the unexposed paper when wetted to be squeegged to the
> wetted paper negative.  The paper had lost about 1 full stop in
> sensitivity and the positive had unseemly strains and stains all over.
>
> After much head scratching and testing, we think we can solve this by
> pre-washing the unexposed paper for about 30 minutes but I'd like to
> know more about what it is in the unexposed paper that might be
> responsible for this weird reaction.  The paper we are using is Ilford
> Multigrade IV RC DeLuxe (Pearl).  Ilford says that the paper does not
> have developer in the emulsion.
>
> This is something I had never heard of before and I'd not encountered in
> my own printing from paper negatives before.  But when doing tests with
> standard size paper, we found that this happens when the unexposed paper
> is left wet for several minutes before exposure and processing.
>
> Any thoughts or suggestions are most welcome.
>
> Cheers,
>
> Guy
>
>
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