Polyvinyl alcohol does not seem to provide consistent results, some people
say it works, others say it doesn't, but what else is new with pt/pd printing.
The glycerine is being used to slow the drying as the New Mexico humidity
can be quite low.
I am not as strong an advocate of polyvinyl alcohol as I once was.
Liquitex medium has been reported to work well but I haven't done any
experiments with it.
Heico is probably pretty close to the Kodak product so I'd try it and see. I
would be curious to hear any comments from folks as to the advisability of
introducing sulfur compounds into the platinum process in view of the
notorius reputation they have in conventional silver photography. They're
obviously not going to attack the platinum image, but what about paper
permanence?
Dick S.
Dick Sullivan
Bostick & Sullivan
Santa Fe, New mexico