[alt-photo] Re: cyanotype 1A:1B/2A:1B question

[zphoto at montana.net]

John, I find it about a stop faster, but grain can be an
issue with too much FAC.  I switched back to 1:1 (20% A, 8%
B) and students are finding an exposure time, say, in an
Edwards unit, of 20min.  I think formerly the exposure times
were 9-12 if I remember correctly.
Chris

----- Original Message -----
From: "John Brewer" <john at johnbrewerphotography.com>
To: "'The alternative photographic processes mailing list'"
<alt-photo-process-list at lists.altphotolist.org>
Subject: [alt-photo] cyanotype 1A:1B/2A:1B question
Date: Mon, 8 Feb 2010 17:32:17 -0000

>Can anyone tell me roughly how much faster cyanotype
>sensitizer is when doubling solution A.
>
> 
>
>Thanks,
>
> 
>
>John.
>
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