Part of Mike's very useful posting:
> A positive, non-destructive test for Platinotypes - by Mike Ware.
>
> Place a tiny drop of hydrogen peroxide solution on a dark region of the
print.
> (The hydrogen peroxide should be the ordinary domestic variety, so-called
> '10-' or '20-volume', i.e. 3% to 6%.)
> If the print contains a significant amount of platinum,
Thanks for this. Presumably a positive result should thus also be given by
platinum toned silver prints of any type (including kallitype) and also
silver-platinum processes - such as the Satista paper, although these will
presumably contain far less platinum.
Peter Marshall
Family Album/Gay Pride - http://www.dragonfire.net/~gallery/index.html
Also on Fixing Shadows: ----------- http://fermi.clas.virginia.edu/~ds8s
Future Press and elsewhere... E-Mail: petermarshall@cix.compulink.co.uk