[alt-photo] Re: Gum...again!

[Marek Matusz]

Paul,

In total agreement with Chris. A short soak in metabisulfite solution always clears the stain and the colours return to their naturall brilliant hue. I like to "overexpose mine" as a matter of a workflow, but by the same token, I would say the old practice caled for undeexposing of gum. I always have a visible stain (visible image) after exposure, but it goes away with just plain water development most of the time.

I was hoping to do a printing session today, but it is raining and every time I print cyan during rain I run into registration problems. I'll just have to wait til tomorrow.

Marek
 
> From: zphoto at montana.net
> Date: Fri, 14 May 2010 20:29:28 -0600
> To: alt-photo-process-list at lists.altphotolist.org
> Subject: [alt-photo] Re: Gum...again!
> 
> Paul,
> If you go to here:
> 
> http://christinazanderson.com/Text_page.cfm?pID=2076
> 
> and scroll down you will see a comparison with a gross overexposed border, before and then after cleared in potassium metabisulfite. So if you are having troubles getting dull colors, buy some. 2 tsp. per liter, soak the print 2-5 minutes. Otherwise the simpler solution would be not to overexpose...or cut your dichromate down to either a 7.5% or 15%. Or develop longer for the brownish dichromate stain to disappear. If I develop too little I notice more of that dullness left behind.
> Chris
> 
> 
> Christina Z. Anderson
> christinaZanderson.com
> 
> On May 14, 2010, at 8:17 PM, Keith Gerling wrote:
> 
> > I'm sure there must be an explanation for what you observe, and maybe
> > somebody can offer it. But I have to say that I have over-exposed on many
> > occasion - sometimes grossly, and i have not observed a drastic change in
> > color. Subtle maybe, because of the tanning effects of the gum itself, but
> > mostly the end result is exactly like the pre-exposed gum+pigment.
> > 
> > Please, oh please Gods Of Gum! Do not inflict upon me another ill! I've
> > had so many... But not this one.. Yet...
> > 
> > On Fri, May 14, 2010 at 6:33 PM, Paul Viapiano <viapiano at pacbell.net> wrote:
> > 
> >> Hi all...
> >> 
> >> I've been printing away here since my entry to gum one year ago, exploring
> >> this and that and being accepting of the vagaries of the gum experience,
> >> going with the flow, etc...and having a lot of fun among the
> >> disappointments.
> >> 
> >> But today, while experimenting with different papers for making unwaxed
> >> paper negatives (I've been using waxed negs for gum for the last few months
> >> or so) I ran across something which I don't think I've seen mentioned;
> >> either that or I am totally losing my mind. And that is how drastically
> >> overexposure can totally change a color or certain colors.
> >> 
> >> I'm used to seeing dull colors after development, nothing like the brushed
> >> out color intensity of just pigment mixed with the gum, and although I've
> >> tested exposure many times with my wedges, I don't think it really hit me
> >> until today that not only will an overexposed layer take longer to develop,
> >> it drastically changes and dulls the original color.
> >> 
> >> I think I've been overexposing all along...
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