Re: Seeking Information on 2 problems with Gum process
- To: firstname.lastname@example.org
- Subject: Re: Seeking Information on 2 problems with Gum process
- From: Keith Gerling <email@example.com>
- Date: Wed, 30 Apr 2008 09:00:41 -0500
- Comments: "alt-photo-process mailing list"
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I use a dilute mix of ammonia (my preference is to use sodium
carbonate - washing soda - but darned if I can even find it
anymore....) and it does turn it lavender. Briefly. But it dries
back to normal.
No, I have not had any problems with it affecting the gum layer, but
the ammonia is very dilute anf the bleach bath is very brief. I'm
curious about that acid-bath-reverting-back. I'll try that.
On Wed, Apr 30, 2008 at 8:45 AM, Christina Z. Anderson
> The ammonia turns the cyanotype lavender, correct? Does this interfere
> with your color balance?
> And have you ever returned the gum print to an acid state and seen it
> revert back to blue again or no? In other words, I wonder if it would change
> over time if returning to a more neutral or acid condition.
> One other question--does the ammonia eat away at your gum layer?
> ----- Original Message ----- From: "Keith Gerling"
> To: <firstname.lastname@example.org>
> Sent: Wednesday, April 30, 2008 7:29 AM
> Subject: Re: Seeking Information on 2 problems with Gum process
> > 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 <email@example.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 >
> > > > 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
> > > 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
> > > learning curve that I knew to do --
> > >
> > > So, next iteration of cyanotype stage variation belongs to you!
> > >
> > > Thanks
> > >
> > >