Re: Another gelatin hardening question

Try using formaldehyde to harden gelatin sizing. I've used it for years,
printing cyanotype and gum with great results. It yields ready-to-print
paper in 24 hours or less with no need for extended curing periods. It's
very windy and dry here, so that's a factor.

Best regards from Big Wonderful Wyoming,
Dave Rose
http://www.alternativephotography.com/artists/dave_rose.html

----- Original Message -----
From: "Keith Gerling" <Keith@gumphoto.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Thursday, July 15, 2004 3:50 AM
Subject: Another gelatin hardening question

> After a batch of paper has been sized and dried, I usually put them all in
a
> stack and flatten them under a heavy weight. Is this bad? Does the
> hardening process like to have a flow of air?
>
> -----Original Message-----
> From: Keith Gerling [mailto:Keith@gumphoto.com]
> Sent: Thursday, July 15, 2004 3:53 AM
> To: alt-photo-process-l@sask.usask.ca
> Subject: Gelatin hardening question
>
>
> I've been having some sizing problems lately. Problems I never have in
> months that are cold and dry. I harden gelatin with chrome alum and give
it
> a day to harden. Searching through the archives, I found a post where
> Philippe Monnoyer mentions that chrome alum takes up to a month to
> completely harden. Can someone elaborate on this? The degree of
hardening
> per unit of time is obviouslynot linear. What degree of hardening takes
> place in 24 hours? How about in a week? Would glyoxal harden faster?
> Lastly, is higher heat and humidity known to have a factor in the
hardening
> process?
>
> Thanks.
>
> Keioth
>
>
>
Received on Wed Jul 14 19:43:19 2004