From: Graeme Lyall (graeme.lyall@ntlworld.com)
Date: 07/20/03-01:20:46 AM Z
I haven't been following this discussion - but I have had the privilege of looking at the Anna Atkins cyanotypes, made in the 1840s, which make up her book on British algae. Some of them are so fresh they might have been made yesterday. Compared with that, most silver based photographs from the period have fared very badly. I pretty much think of cyanotypes as permanent.
----- Original Message -----
From: Robert W. Schramm
To: alt-photo-process-l@sask.usask.ca
Sent: Sunday, July 20, 2003 3:36 AM
Subject: Re: Toning Cyanotype
I think the idea that tanic acid toned cyanotype are not permanent is another myth like the one about cyanotype itself not being permanent. I have some, at least, ten year old cyanotypes that were toned with tanic acid that show no sign of fading. I also have a cyanotype postcard with a 1904 postmark that looks just fine. If you are worried, why not put a toned cyanotype in a sunny window for about a month. Cover one half with black paper. That ought to give you some idea.
Bob Schramm
Check out my web page at:
http://www.SchrammStudio.com
>From: el swami
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: alt-photo-process-l@sask.usask.ca
>Subject: Toning Cyanotype
>Date: Sat, 19 Jul 2003 13:33:16 -0700
>
>The other post about tannic acid made me think to ask a question. I
>have heard that tannic acid is a fairly impermanent toning option
>for cyanotype, & of all the other toning options I have come across,
>all of them have been cautionary on permanence. Are there any
>"archival" options out there aside from untoned cyanotype?
>
>I tried Selenium toner, and I am pretty happy with it, though I
>don't know what metallic compound is formed, or how "archival" it
>is. Are there other options out there?
>
>Thanks.
>
>-Joe
>
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