Eric, I used oxalic acid pre-soak with Whatman HP watercolor paper only (2%,
for 2mins), back when I was making my first tests with Ziatype. Later, I
realized that I don't need this extra step with that paper.
Anyway, I write this to let you know that Whatman didn't exhibited any
coating problems and excessive absorption after oxalic acid pre-soak,
FWIW...
Whatman is probably sized with Aquapel, not gelatine since Mike Ware is
recommending it for Argyrotypes saying "...Only the best cotton fibre,
internally sized with Aquapel and free of other additives, will do. Papers
that I have found to work well are Whatman's Watercolour or Printmaking
papers and..." Were all the papers you tested sized with gelatine?
Regards,
Loris.
________________________________
From: Eric Neilsen [mailto:e.neilsen@worldnet.att.net]
Sent: 31 Mayıs 2006 Çarşamba 00:01
To: alt-photo-process-l@usask.ca
Subject: RE: Platinum/Palladium & Paper Speed
Marc, Several papers that I have tested the oxalic acid soak on required a
new sizing be put on the paper; gelatin would be a good example. If not, the
coating solution would just soak right into the paper. There is no way one
can spread it around without it and least not that I have seen.
Received on 05/30/06-03:33:02 PM Z
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