RE: Platinum/Palladium & Paper Speed

I had an old supply of Stonehenge natural that since it was no longer
working for PT/PD I thought it might be a good choice. I must certainly was
worse after the acid soak. I don't know what it was sized with.

I also ran a test on Coventry Rag and it also failed without an additional
gelatin coating.

There maybe others I am forgetting now.

Eric

Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
214-827-8301
http://ericneilsenphotography.com
 
Skype : ejprinter

> -----Original Message-----
> From: Loris Medici [mailto:mail@loris.medici.name]
> Sent: Tuesday, May 30, 2006 4:33 PM
> To: alt-photo-process-l@usask.ca
> Subject: RE: Platinum/Palladium & Paper Speed
>
> 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 05/30/06-04:39:41 PM Z