Re: fogged digital negative?
Knowing which corners you can cut and when comes through mastery of the
process...but then the gremlins always seem to undermine 'masters' as
well as beginners. Taking good notes helps.
A wonderful tip from Keith Taylor to me was to dry my printed pictorico
media in a print drier for 20 minutes prior to contact printing (after
letting it air dry for 2 hours). I actually do it for a different
reason that you Gregg - I dry pictorico to prevent air bubbles when in
contact with 'tackier' polymer plates such as the KM73. But if drying
the pictorico is the solution, using a print drier or hair drier on it
-- and perhaps your coated paper -- may help. Drying wet-coated paper
in a print drier may not be a good thing to do for health reasons with
some processes, however, I don't known. Others on this list would.
Best of luck!
Jon
Gregg Kemp wrote:
wow! 2 weeks is a long time. I haven't had trouble with others that
I've used after drying a short time (less than a day, a day or two.
But I really haven't paid much attention to how long I've let the
negatives dry before using. I printed a replacement for the bad one
last night and I plan to print with it today. But, I'll take your
suggestion and print another to "cure" for a few days. I'm also going
to pay more attention to the time I allow the sensitized paper to dry
before printing with it. I think that may have been a problem also,
as Jon pointed out. I had a couple of prints stick to the OHP around
the edges of the paper - just a little, but enough to know they
definitely weren't dry yet.
Anyway, thanks for the feedback from everyone. I think I just need to
not rush things.
- Gregg
On Apr 13, 2008, at 7:44 AM, Manuel Gomes Teixeira wrote:
Gregg,
I know exactly what you mean.
This problem happened to me several times with both the Pictorico
and the Agfa Copyjet.
The only way I found to overcome this, was to let the OHP to dry
for several days without any permanent contact with any other
surface, like a film sleeve.
I think that the problem is in chemical interaction with with the
ink with and the paper before the negative is completed "cured".
When I said several weeks I mean at least two weeks.
If I don't respect this drying period I'll notice some funny
"fogging " patterns that fit perfectly with the contact zones of the
OHP film with the paper.
My DN's are printed with the Epson 2200.
I hope this helps
Manuel Gomes Teixeira
On Apr 12, 2008, at 9:25 PM, Gregg Kemp wrote:
I was printing some cyanotypes today and one of my digital negatives
seems to have "fogged". I've printed with this negative 3-4 times
before, with fairly consistent results. But today it added a dark
ring around the print. When I looked at the negative, it looked OK
on the inkjet side, but the other side had a strange, silvery fog to
it. The effect was to lighten the negative and print out darker
around an area about 6 inches in diameter.
Is this a normal problem for a digital negative - a short life
span? Or did I do something wrong - maybe use it too soon after
printing the negative. I don't remember how long I waited before
using it to make a print. But I've used it several times over
several weeks. I'll make another negative, but just wanted to check
here to see what I may have done wrong. The negative requires a 9
minute exposure for the cyanotype and paper I'm using. I'm printing
with a UV lightbox that's around 26 x 20 inches or so, and about 4
inches from the bulbs.
- Gregg
Gregg Kemp
gregg@roanokesound.com
http://www.greggkemp.com
--
Jon Lybrook
Intaglio Editions
http://intaglioeditions.com
303-818-5187
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