Hi Mark,
I don't even need to shine a light to see them. They're visible even
in the dim, indirect light of my exposure booth. They're like these
grey clouds that start on the peripherals of the KM73 plate within the
first minute and encroach toward the center as the drawdown time
increases. Baby powder and short drawdown times on the image seem to
keep them at bay, but don't eliminate them. Again, it's only an issue
with Pictorico OHP and the KM73 plates.
I tried a quick test this morning using Krylon workable fix and the
bubble/patches were not appearing. This is very encouraging and YAY
Susan for thinking of it! Hoping Susan and I (and anyone else
interested) can methodically test some different sprays, along side an
transparency containing no spray, to find one that's fine enough and
doesn't sputter or change the clarity or apparent density of the film
too much.
I can try the following:
Krylon Workable Fixatif
Krylon Acrylic Clear Coat
Rustoleum Enamel Clear Glossy
I also have some photo lacquer spray in stock, but it has UV inhibitor
in it, so I'm guessing that wouldn't be good.
Anyone else working with the KM73 plates and OHP want to volunteer to
try some different sprays, other than the ones I've listed?
Thanks!
Jon
Ender100@aol.com wrote:
Jon,
When you look at the sandwiched OHP and plate, say with a light shining
on it at an angle, can you easily see the air bubbles?
Mark
In a message dated 2/27/07 12:35:07 PM, jon@terabear.com writes:
Hey all,
I tried putting a KM73 plate I had sitting out all night with the mylar
removed into my vacuum frame with a fresh, clean piece of OHP. It
didn't affect the air patches, which were apparent in under a minute, as
usual. Attempting to press them out (through the Krene plastic I'm
using instead of glass) with a brayer after drying out both the plate
and the transparency with a hairdryer for a few minutes didn't have any
affect either.
I'm anticipating Susan's idea about treating the transparency with a
spray coating of something prior to exposing it helps this tackiness
problem. I'm also hopeful it doesn't introduce any new problems
(besides the health risks of aerosol glues and paints)! Looking forward
to hearing about her results and trying it out myself soon.
Thanks,
Jon
Best Wishes,
Mark Nelson
Precision Digital
Negatives - The System
PDNPrint Forum at Yahoo
Groups
www.MarkINelsonPhoto.com
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