From: Liam Lawless (liam.lawless@blueyonder.co.uk)
Date: 04/02/02-06:26:11 PM Z
Keith,
I ain't done it for a very long time (& never on duplicating film), but
there is a really easy way that I expect will be suitable. But you'll have
to do a bit of testing... and let us know the results!
You'll need to overexpose the film a stop or two, then develop normally.
After that, rinse in clean water for about 30 seconds - NOT an acid stop
bath. Then put the film in a sepia toner solution (which should be of the
odourless variety for darkroom use). You'll now have a greenish-grey image
on a brown ground that it's safe to handle in white light.
After washing, the film goes into a ferri-bromide bleach (or similar) until
the silver is reduced. Try 50 g pot. ferri. + 25 g pot. brom. in 1 litre.
Then wash and fix. Result: a brown positive, normally of fairly low
contrast. But I expect you'll have to fine-tune the printing exposure.
Liam
-----Original Message-----
From: Keith Gerling [mailto:keithgerling@att.net]
Sent: 03 April 2002 00:23
To: alt-photo-process-l@sask.usask.ca
Subject: Reversing Dupe Film
Does anybody here know of any easy way to reverse-process duplicating film,
i.e., so that a positive will be the result of an enlarged negative, rather
than just a bigger negative?
I know this is an oddball request, but I just bought a rather large amount
of outdated very large duplicating film that I had assumed was lith film!
Thanks,
Keith
This archive was generated by hypermail 2b30 : 05/01/02-11:43:28 AM Z CST