RE: odd cyanotype behavior

Maybe this paper is buffered with an alkaline agent - cyanotype hates
alkali and in fact likes an acid environment....
My 2c worth.
Kate

-----Original Message-----
From: ryberg [mailto:cryberg@comcast.net]
Sent: Thursday, 26 May 2005 10:27 a.m.
To: alt-photo-process-l@sask.usask.ca
Subject: odd cyanotype behavior

     Locally there are several brands of inexpensive, good quality cold
pressed watercolor paper available. However, I usually prefer the
smoother surface of hot pressed paper which is, at least where I shop,
only available in large (and more expensive) sheets. I tried a paper
called #234 PARIS BLEEDPROOF PAPER FOR PENS BY BORDEN AND RILEY. After
a couple of test prints I made what looked like a perfect print but I
was called away and let the print soak for about an hour. When I
returned the print had faded drastically and lost all its blue color,
leaving a gray image.
    I soaked a print on a different paper that long and longer with no
loss of image so I assume it is something to do with the paper. Has
anyone ever noticed this kind of behavior?
     Very preliminary tests indicate that the pale gray image might tone
up to a darker image in one or more of the common acids. Any thoughts?

Charles, Portland Or.

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