January 2006 Alt-Photo-Process-L: Fwd: cyanotype speckling

From: Ender100@aol.com
Date: 01/28/06-01:53:41 PM Z
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Date: Sat, 28 Jan 2006 14:52:00 EST
From: Ender100@aol.com
Subject: Re: cyanotype speckling
To: alt-photo-process-l@sask.usask.ca
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Chris,

I imagine there in Montana it is pretty dry right now, so drying time would=20
correspond better to residual moisture content of the coating/paper than in=20=
a =20
more humid climate like the South American rain forrests. I'm guessing you=
=20
have two factors? Chenge in moisture content and then loss of speed due to=
=20
aging of the emulsion. Have you checked the Stanford website where they ra=
n=20
tests on some of these variables?

http://albumen.stanford.edu/

Mark I. Nelson
www.MarkINelsonPhoto.com
www.PrecisionDigitalNegatives.com
PDNPrint Forum @ Yahoo Groups

In a message dated 1/28/06 10:37:32 AM, zphoto@montana.net writes:

>=20
> And, I've been having a blast printing that same print (uncurved and curve=
d)
> at 30 minutes dry time (usual), 5 hr, 30 hr, and a week to examine contras=
t
> and speed of coated paper.=A0 It appears that there is a small loss of
> contrast and speed with paper that sits a while, but not enough to make it
> throwaway.=A0 My two cents. I'd appreciate other experiences here, too.
> chris
>=20
>=20
>=20

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<HTML><HTML>Chris, 
 
I imagine there in Montana it is pretty dry right now, so drying time=
would correspond better to residual moisture content of the coating/=
paper than in a  more humid climate like the South American rai=
n forrests.  I'm guessing you have two factors?  Chenge i=
n moisture content and then loss of speed due to aging of the emulsio=
n.  Have you checked the Stanford website where they ran tests =
on some of these variables? 
 
http://albumen.stanford.edu/ 
 
Mark I. Nelson 
www.MarkINelsonPhoto.com 
www.PrecisionDigitalNegatives.com 
PDNPrint Forum @ Yahoo Groups 
 
 
In a message dated 1/28/06 10:37:32 AM, zphoto@montana.net writes:<BR=
>
 
 
<BLOCKQUOTE CITE STYLE=3D"BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT=
: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px" TYPE=3D"CITE"><FO=
NT COLOR=3D"#000000" FACE=3D"Geneva" FAMILY=3D"SANSSERIF" SIZE=3D"2">=
 
And, I've been having a blast printing that same print (uncurved and =
curved) 
at 30 minutes dry time (usual), 5 hr, 30 hr, and a week to examine co=
ntrast 
and speed of coated paper.=A0 It appears that there is a small loss o=
f 
contrast and speed with paper that sits a while, but not enough to ma=
ke it 
throwaway.=A0 My two cents. I'd appreciate other experiences here, to=
o. 
chris 
 
 
</BLOCKQUOTE> 
 
 
 
 
 
 
</HTML>

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Received on Sat Jan 28 13:54:19 2006