RE: Réf. : RE: Need Advice on Thick Gum Coating

Philippe,
What did you mean?
Marek

>From: Philippe Berger <mineurdecharbon@skynet.be>
>Reply-To: alt-photo-process-l@usask.ca
>To: alt-photo-process-l@usask.ca
>Subject: Rf. : RE: Need Advice on Thick Gum Coating
>Date: Thu, 06 Apr 2006 15:35:34 +0200
>
>Are you a image of your gum ?
>
>philippe
>
>
>-------Message original-------
>
>De : Marek Matusz
>Date : 04/06/06 15:32:45
>A : alt-photo-process-l@usask.ca
>Sujet : RE: Need Advice on Thick Gum Coating
>
>Sandy,
>Try a foam roller for smoothing your gum. it works for a lot of people on
>this list, including myself. I like your idea of exposing the print from
>the
>back. Glass would be good testing surface. Maybe if the gum is exposed
>through the glass it will not wash off.I am going to run a few tests
>meyself. I have been experimenting with a mix of gum and gelatine for a one
>coat direct print with some success so I am interested in the subject.
>Marek, Houston
>
>
> >From: Sandy King <sanking@clemson.edu>
> >Reply-To: alt-photo-process-l@usask.ca
> >To: alt-photo-process-l@usask.ca
> >Subject: Need Advice on Thick Gum Coating
> >Date: Wed, 05 Apr 2006 17:53:28 -0400
> >
> >Although I am not currently involved in gum printing the current
>discussion
> >got me interested in running a test to illustrate the concept that in gum
> >printing the hardening of the gum is top down. So I mixed up 100ml of a
>1:1
> >solution of saturated potassium dichromate and lithorgraphers 14 Baume
>gum,
> >and added ten grams of lampblack to the mix. I applied three thin coating
> >of this to a piece of vellum and exposed it, through the back, with one
>of
> >my carbon negatives for 30 minutes with a UV printer. Exposure for carbon
> >would have been on the order of 4-5 minutes but the extra density of the
> >paper based added about two stops of exposure.
> >
> >The print is not bad. Dmax is much higher than one could get with a
>single
> >coat of gum, and yet there is a full range of tones. The only problem is
> >that I was not able to get a smooth coating so there are a few streak in
> >the print. The results were so interesting that I plan to do some more
> >experimenting with this kind of printing.
> >
> >So, wonder if someone with more experience than me could advise as
>regards
> >the best way to mix and apply very heavily pigmented gum emulsions using
> >the 14 Baume lithographers gum.
> >
> >Sandy
>
>
>
>
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Received on Thu Apr 6 11:10:14 2006