Re: GUM TESTING

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From: Kate Mahoney (kateb@paradise.net.nz)
Date: 07/15/03-01:02:51 AM Z

Ummm....maybe i should have read all the mail from today before writing
(blush blush)
Kate
----- Original Message -----
From: "Kate Mahoney" <kateb@paradise.net.nz>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Tuesday, July 15, 2003 6:46 PM
Subject: Re: GUM TESTING

> Hi Christina, you will probably find that the reason that the amm di
stains
> more than the pot di is that you get a more saturated solution with amm
di -
> more chemical in the mix, therefore more staining!
>
> Kate Mahoney (New Zealand)
> ----- Original Message -----
> From: "Christina Z. Anderson" <zphoto@montana.net>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Tuesday, July 15, 2003 1:16 AM
> Subject: Re: GUM TESTING
>
>
> > Good morning Katharine!
> >
> > Yes, this is why I even tried it in the first place, because as I had
said
> > when I originally posted it, if dichromate is sensitive to sun, why
would
> it
> > then bleach OUT in the sun?? I only came across that method in one
book,
> > and most of the other tidbits I've picked up I've come across numerous
> > times.
> >
> > Anyway, the prints I used were 8x10 one layer exposures (full prints)
that
> I
> > had developed out, dried, but not cleared. These were done
presensitizing
> > the paper with saturated solutions of the two dichromates, and then
> painting
> > the pigment/gum/no sensitizer on top of the dried sensitized paper.
Thus
> I
> > had a good border of dichromate with no pigment on top. I was
observing
> > just the dichromate stain in the borders of the prints. Every time in
> > comparison between ammonium and potassium dichromate that border stain
> (and
> > it literally is a dichromate stain, no pigment) is darker in ammonium
than
> > in potassium. Thus the ammonium has more ways to go, which is why I
> covered
> > up half the print to see the difference in bleaching. The potassium did
> > bleach out, the ammonium did lighten but was not entirely gone.
> >
>
>
>
>

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