Try masking the paper before coating. Use low-tack masking tape,
as used by painters & decorators. Usually removes cleanly (before
exposing), but if necessary soften the glue with a warm hair dryer. Take care
that your sensitiser doesn't puddle in the corners, otherwise it may seep under
the tape.
Liam
From: sharperstill@gmail.com
[mailto:sharperstill@gmail.com] On Behalf Of Jon Reid
Sent: 01 July 2009 11:07
To: alt-photo-process-l@usask.ca
Subject: Masking contact prints
Hi all,
I last contacted the list with some sharpness problems when contact
printing (Pt/Pd). My father has since modified my contact printing frame and
produced more pressure. I noticed the other night that when printing 5x7 negs
for around 5-7 minutes there were no soft patches at all, but by the time I'd
gotten to the desired exposure I was at 9m45sec and was getting soft stripes. I
figure it was to do with the heat build up and i'll try building up the
exposure incrementally with breaks to let the heat dissipate.
Anyway, my question to the group is as follows. I'd like to know peoples ideas
for best way to mask the neg during exposure to prevent black borders. My
method which is failing was to cut a 5x7 rectangle in a piece of black card and
to stick the negative into this card using ruby-lith to not only hold it in
place but to mask the shoulder/film edge etc and create a clean rectangle. The
thickness of the card is about equal to the film and thr uby-lith was on the
glass-side.
I intend to exhibit these images and wish to present them un-matted, on 11x14
paper. What's happening is that next to the print edges, about 1mm away, I am
getting sporadic short lines of exposure that looks like it's refracting
through the film-edge or something.
As stated I want to exhibit these unmatted and would like to know if anyone has
a better way of masking these negs accurately?
Cheers all,
Jon
--
http:www.sharperstill.com