U of S | Mailing List Archive | alt-photo-process-l | Re: Seeking Information on 2 problems with Gum process

Re: Seeking Information on 2 problems with Gum process

  • To: alt-photo-process-l@usask.ca
  • Subject: Re: Seeking Information on 2 problems with Gum process
  • From: Keith Gerling <keith.gerling@gmail.com>
  • Date: Wed, 30 Apr 2008 08:29:17 -0500
  • Comments: "alt-photo-process mailing list"
  • Delivered-to: alt-photo-process-l-archive@www.usask.ca
  • Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com;s=gamma;h=domainkey-signature:received:received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references;bh=lQL7sLOoMGaIHPzEmCbe2IGgGmllxCW00f1zrIRaehk=;b=C0L9Ojdj1rlSXzA0LPVhLY/UrrL072hMXlZK6GapGwdeeLBwSd6/I3l5QGFdKQnvAJC51pyAxvyvzMAnD1oChnoVEnYgv/esQ7aCBc2vSv4rzG+tsOoVx0DHCtgFLeC853L9T3A4rsxB7KmbYL7P2fUNndKtUUpUk7ESQUPNT1E=
  • Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma;h=message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references;b=md+v1S1B4mi3FinOOad1vB2mqyqADQxmuGvpGVVlNZLQgq/qKdfk8amLnCANhxXhWQO8EhJdLtX4IQ+BbwTpQ1IIWKkJlFyo0FtidFbHWEgrKzjm8q3VgKgBWCSbdN/Mw+RdAFOMgO2oRnrMfoewboDaLpM47cHdZM+C2YyMgY8=
  • In-reply-to: <48184EE8.5010609@vt2000.com>
  • List-id: alt-photo-process mailing list <alt-photo-process-l@sask.usask.ca>
  • References: <C43E040A.C88D%henry.rattle@ntlworld.com><48184EE8.5010609@vt2000.com>
  • Reply-to: alt-photo-process-l@usask.ca

As my well-water is somewhat alkaline, the cyanotype layer bleaches
out slightly during the subsequent gum stages.  My approach is to
overprint the cyano layer to the point where it is much too dark, and
then to bleach it back to where I want it when the gum is finished.  I
use dilute ammonia.

On Wed, Apr 30, 2008 at 5:50 AM, cadunn <cadunn@vt2000.com> wrote:
> Henry wrote:
>  but I found it much better to dilute
> > the coating solution with anything up to six or seven times its own volume
> > with water. You can hardly see it as you coat it, but the blue is there OK
> > and you can give it full exposure. Dilute solutions seem to need rather
> less
> > exposure than full-strength ones.
> >
>  lol, Henry -- your msg. came JUST after I had coated the paper and was
> planning on a much reduced exposure time, which is all at this point in my
> learning curve that I knew to do --
>  So, next iteration of cyanotype stage variation belongs to you!
>  Thanks