Re: oil-print-glyoxal??

Katharine Thayer wrote:
>
> Henk,
> Something to consider while you're pondering this question: paper
> manufacturers who gel-size their paper do not use a hardener with the
> gelatin (although they do add a fungicide).
> Katharine

Clarification: I was referring here to watercolor paper, my point being
that if paper manufacturers don't feel the need to harden the gelatin
size they use, maybe we worry about this too much.
Katharine
>
> henk thijs wrote:
> >
> > Since some time I am working with oil-printing; it is much easier to
> > handle compared to bromoil (if one has anyway some big negatives for
> > cyano or gum...), but what about hardening.
> > In principle it is the same way of working compared to gum. Some
> > gelatine layers , a dichromate etc.; but no glyoxal,formaldehyde or
> > chromealum after sizing (one needs the swelling of the gelatine, so a
> > hardening at that stage cannot be done).
> > After the inking, I am not sure if the gelatine at the highlights is
> > protected against bacterie-growth, there is little or no ink at the
> > highlight-areas. I could not find any info in the books.
> > Any idea??
> > Cheers,
> > Henk
> > --
> >
> > --------------------------------------
> > H e n k T h i j s - P h o t o g r a p h y
> > photography http://www.thijs-foto.com
> > member of F68 http://www.f68.nl
> > --------------------------------------
Received on Fri Dec 24 12:39:54 2004