RE: I'll never double coat cyano again -- was what I've learned about cyanotype

Strangely I have found the opposite in the past - and became a confirmed
double-coater. However today I went to print what I'd coated yesterday,
and one of my beloved students had put VDB into the syanotype bottle.
Instead of my lovely blueprints, I got a brownprint - not what I was
aiming for at all!!!

But on the double coating - maybe it's paper dependent?

Kate Mahoney
www.katemahoneyphoto.co.nz

-----Original Message-----
From: Robert W. Schramm [mailto:schrammrus@hotmail.com]
Sent: Tuesday, 7 June 2005 2:30 p.m.
To: alt-photo-process-l@sask.usask.ca
Subject: RE: I'll never double coat cyano again -- was what I've learned
about cyanotype

I don't believe double coating cyanotype does anything to improve the
image
unless not enough
sensitizer was used during the first coat. I have found that using 2
parts A
to one part B does
improve Dmax and contrast range. Have you tried this?

Bob Schramm

Check out my web page at:

  http://www.SchrammStudio.com

<br><br><br>&gt;From: ryberg
&lt;cryberg@comcast.net&gt;<br>&gt;Reply-To:
alt-photo-process-l@sask.usask.ca<br>&gt;To:
alt-photo-process-l@sask.usask.ca<br>&gt;Subject: I'll never double coat

cyano again -- was what I've learned about cyanotype thru
PDN<br>&gt;Date:
Mon, 06 Jun 2005 15:06:35 -0700<br>&gt;<br>&gt;Several of you have said
that
double coating increases DMAX. I had always<br>&gt;believed that. But
the
tests I showed yesterday led me to doubt it. I<br>&gt;exposed pairs of
Stoufer strips, one on single coated cyano, one on double<br>&gt;coated.
I
did six exposure times. All of these showed the same or
better<br>&gt;DMAX
with single coating. Further, the single coat always showed a
longer<br>&gt;scale. You can see the results on my web page--I added
these
new tests at<br>&gt;the end of the earlier cyano note.<br>&gt; I
HOPE
that I have optimized the images for the web and that it
won't<br>&gt;take
too long for a dial-up, though the final image of the 6 pairs is
pretty<br>&gt;big.<br>&gt;
http://home.comcast.net/~cryberg/index.html<br>&gt;Thanks, Charles
Portland
OR<br>&gt;<br>

-- 
No virus found in this incoming message.
Checked by AVG Anti-Virus.
Version: 7.0.322 / Virus Database: 267.5.1 - Release Date: 2/06/2005
 
-- 
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.322 / Virus Database: 267.5.1 - Release Date: 2/06/2005