Re: Cyanotype fading at dying (dry-up effect)

["Robert W. Schramm" <schrammrus@hotmail.com>]

Some papers are buffered with a mild base. This is common practice with 
materials used for archival work. Sometimes the paper manufacturer does not 
give this information. So, just a guess, but have you tested the pH of the 
paper you are using? Any base will cause fading of cyanotype.

Bob Schramm

>From: Stane Kočar <revija.les@siol.net>
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: alt-photo-process-l@sask.usask.ca
>Subject: Cyanotype fading at dying (dry-up effect)
>Date: Mon, 20 May 2002 11:29:30 +0200
>
>After trying quite a lot of different papers with both classical and MW 
>cyanotype I noticed, that all my cyanotypes fades at drying - just opposite 
>the dry-down. When picture is OK when wet, it becomes to pale when dries up 
>- let say for minimal one zone.
>First I thought that our water contains too much carbonates, so I washed my 
>pictures whole time in acidified water (with citric acid) and fading was 
>again there.
>Anybody has an explanation of that effect? (I looked at archives and did't 
>find any answer).


Check out my web page at:

  http://www.SchrammStudio.com

also look at:

  http://www.wlsc.wvnet.edu/www/pubrel/photo.htmlS

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