Re: What are the advantages of using Cyanotype as the first layer for tri-color gum prints? Paper Problems...

I too use Arches Aquarelle successfully for cyanotypes. Like Robert it
sounds like not enough exposure for the cyanotype layer. I use the addition
of acid to alter the contrast but it will increase the density of
underexposed prints. If you want me to send you the acid info printed in
Historic Photographic Processes by Richard Farber and the method I use feel
free to e-mail me off list.

Cheers

John.

----- Original Message -----
From: "Robert" <rc3@flash.net>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Saturday, September 17, 2005 10:38 PM
Subject: RE: What are the advantages of using Cyanotype as the first layer
for tri-color gum prints? Paper Problems...

> Sounds like hot water or not enough exposure for the cyanotype. I use both
> papers and have had no problems. I sometimes size after the cyan type
> layer
> depending on which pigment gum layers I will be using.
>
> Best Regards,
> Robert
>
> -----Original Message-----
> From: Baird, Darryl [mailto:dbaird@umflint.edu]
> Sent: Saturday, September 17, 2005 11:58 AM
> To: alt-photo-process-l@sask.usask.ca
> Subject: RE: What are the advantages of using Cyanotype as the first layer
> for tri-color gum prints? Paper Problems...
>
> Carmen,
>
> look at Sam Wang's gum printing process at unblinking eye. he comments
> on the cyano layer
>
> also I "hear" that very hot water can cause problems with internal
> sizing of papers
>
> http://unblinkingeye.com/Articles/3CG/3cg.html
>
> Darryl Baird
>
> -----Original Message-----
> From: Carmen Lizardo [mailto:carmenlizardo@yahoo.com]
> Sent: Sat 9/17/2005 2:31 PM
> To: Alt Photo
> Subject: What are the advantages of using Cyanotype as the first layer
> for tri-color gum prints? Paper Problems...
>
> Dear List:
>
> What are the advantages of using Cyanotype as the
> first layer for tri-color gum prints? And, which paper
> is good to use with the cyano-gum process?
> I am asking because I bought many sheets of 300 LB
> Fabriano Artistic and Arches Aquarelle paper, and the
> paper did not work for cyanotype. The cyonotype
> emulsion turned blue-green when dried had blue spots
> and after exposing, the emulsion would wash off almost
> completely, leaving a very faint print with blue
> spots. Judy suggested trying acidifying the paper. I
> did not have any acid except white distilled vinegar,
> which I used, mixed 1:1 with distilled water, and that
> seemed to resolve the problem (thanks Judy!). I did
> test the paper with a gum print using thalo blue
> watercolor and it cleared fine on pre-shrunk, un-sized
> paper. I am using 300 lb paper because I am making
> very large gum prints and the lighter paper was
> falling apart when soaked in very hot water. Maybe
> there is a lighter weight paper that is cheaper than
> the 300 lb and will work well for 22x30" gum prints?
>
> Thank you for sharing your expertise.
> Carmen
>
>
>
>
>
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Received on Sat Sep 17 13:56:51 2005