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 15:48:31 2004