[pure-silver] Re: "Dry Down"
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 1 Dec 2009 20:29:49 -0800
----- Original Message -----
From: "Elias Roustom" <elroustom@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, December 01, 2009 8:23 PM
Subject: [pure-silver] Re: "Dry Down"
Dry Down. yes. sorry about the misnomer.
Tim, I'm not sure it's just about illumination. There's
something
happening with the paper, maybe close to what Dennis is
saying.
I keep a 60 Watt bulb in the darkroom for viewing, and I
never get too
close to it. My prints always dry darker. They look
perfect wet : )
Elias
On Dec 1, 2009, at 8:57 PM, Dennis Purdy wrote:
On Dec 1, 2009, at 17:36, Elias Roustom wrote:
Is the dry back effect of fiber prints something to do
with how a
sheet look wet vs. dry, or is there more to it than
that?
Is there a chemical process ongoing until the sheet is
fully dry?
Elias
Do you mean dry down affect? I don't notice it as much
with the
modern papers I use compared to the old Agfa Portriga or
Ektalure I
used to use. I was of the opinion that it is due to the
swollen
gelatin when wet allowing more light through. I guess
this forum
isn't really for opinions.. just facts
Sorry Dennis
I've never seen a definitive answer to what causes
drydown but its pretty apparent on some papers. Part of the
effect is just from a sort of filling in of coarse grain
surfaces but I've seen a slight amount on even glossy paper.
The effect is to lower contrast and Dmax. I don't think
there is a way of compensating for it, you just have to
learn what to look for when printing.
Drydown can be reversed to some degree by waxing or
lacqering prints. There is also an odd effect with some RC
papers where drying it under IR light causes an increase in
Dmax. This was confirmed to me by Dave Valvo. If Dave is
still following this list he can probably supply better
explanations than I.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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