Re: Seeking Information on 2 problems with Gum process
- To: email@example.com
- Subject: Re: Seeking Information on 2 problems with Gum process
- From: Keith Gerling <firstname.lastname@example.org>
- Date: Wed, 30 Apr 2008 09:00:41 -0500
- Comments: "alt-photo-process mailing list"
- Delivered-to: email@example.com
- 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=4EE7xhB1m+rQQKcBmuM0kBnYKvnRYOQA9vHO0MSeJU0=;b=eZUzfM17v/LUEF8HDk7Put3lqPXUPukGYSCSEarW1lsH45UXieyMUZMlj1Lxl2fOtSCjruR9s+6HlY9eoFFc59n64am4sOD8BavhO0YDSBJX/JwqfApNZbfhaUPBrSFKAH3ObFMQD4zf5fo6aT55wbdwIPwYnnaDnfi/yrpOZzA=
- 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=rxOfLLjw4W6msy9gz6zE7oiqjfmeclmWNrib341SXmmdmTIZW7T1GPhVyvZ+9OkywwciOXklWBitkQDr2PaP9ch1GeAXHA8oTvVxwbKR3BHRvnbU5VNHH+moN7sOdmWPNIpulbbwxeUJcRizDz6grZJlzaYnZY0X4WT0GZGnYFs=
- In-reply-to: <004a01c8aac8$a8e63760$0200a8c0@DC5YX7B1>
- List-id: alt-photo-process mailing list <firstname.lastname@example.org>
- References: <C43E040A.C88Demail@example.com><48184EE8.firstname.lastname@example.org><email@example.com><004a01c8aac8$a8e63760$0200a8c0@DC5YX7B1>
- Reply-to: firstname.lastname@example.org
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: <email@example.com>
> 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 <firstname.lastname@example.org> 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
> > >
> > >