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

[John Brewer]

Thanks Chris. That's a lot more than I was expecting. If I can expose for
less that will help with my printer issue. That's a pain with the grain
though as I favour Dick Sullivan's recipe, as the addition of ammonium
dichromate might exacerbate the problem. 

John.

-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org
[mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
zphoto at montana.net
Sent: 08 February 2010 18:30
To: The alternative photographic processes mailing list
Subject: [alt-photo] Re: cyanotype 1A:1B/2A:1B question

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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