Re: hp and pot di with pt/pd

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From: Carl Weese (cweese@earthlink.net)
Date: 04/10/03-04:58:23 AM Z

Manuel,

It works quite well. Very dilute potassium chlorate or ammonium dichromate
used as an additive can be preferable to an apporach with A and B ferric
bottles. In fact this is recommended in "The New Platinum Print" on page 57.
One drop of 1% makes a significant contrast boost in an 8x10. I prefer to
make negatives that need no contrasting agent at all, but when necessary I
do it this way. The "B" bottle of ferric would go bad before I'd used three
drops.

---Carl 

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> From: Manuel Gomes Teixeira <punctumgt@netvisao.pt>
> Reply-To: alt-photo-process-l@sask.usask.ca
> Date: Thu, 10 Apr 2003 00:40:20 +0100
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: hp and pot di with pt/pd
> 
> Why  in all  Pt/Pd literature is never advised to use Potassium Chlorate
> solution added to the sensitiser as H2O2 and instead  is added previously to
> the Ferric Oxalate  solution ? Is there any chemical explanation for that ?
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