Re: DeCosse prints

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From: Witho Worms en Jorien van Santen (verzet13@xs4all.nl)
Date: 04/07/02-03:07:26 PM Z


Carl, I have not compaired a platinum pure DOP and POP under the same
conditions. I don't know if they give the same densities. I will make a
comparison though.

Witho

----- Original Message -----
From: "Carl Weese" <cweese@earthlink.net>
To: <alt-photo-process-l@skyway.usask.ca>
Sent: Sunday, April 07, 2002 10:02 PM
Subject: Re: DeCosse prints

> Witho,
>
> OK, those are very different concentrations from the ones I've used, and
may
> very well account for getting a POP print from that chemical
> combination.---Carl
> --
> web site with picture galleries
> and workshop information at:
>
> http://home.earthlink.net/~cweese/
>
> ----------
> >From: Witho Worms en Jorien van Santen <verzet13@xs4all.nl>
> >To: alt-photo-process-l@sask.usask.ca
> >Subject: Re: DeCosse prints
> >Date: Sun, Apr 7, 2002, 11:54 AM
> >
>
> > Hello Alejandro,
> >
> > What I did is :
> >
> > Mix an equal amount of Ammonium Ferric Oxalate (in my case 35%) with an
> > equal amount of Potassium Chloroplatinite (in my case a 33,9%). Equal
means
> > according to the amounts involved in the reaction.
> > I coat on Arches platine and let it dry for 90-120 seconds. After that I
> > make a quick blow with a fan (no heat) for 20-30 seconds (for a 11x14
inch
> > print).
> > Than I print, pre-wash for two minutes and clear in EDTA.
> > I mix al my chemicals myself and I buy powdered metals (salts) at
Bostick's.
> > I use strong concentrations, as said, based on Jeffrey's research. You
can
> > try a double coat. I coat Arches just below a 'bleeding' point. Lately I
> > have been experimenting with a double coat on Arches based on a 20% Afo.
> > This allows me to use a platinum mixture that stays in solution at room
> > temperature and gives me a high D max.
> > Let me know if it worked for you.
> >
> > Cheers,
>


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