Re: Gelatin hardening question

Hi Keith,
How much or what is the concentration of alum that you are using?
Giovanni

----- Original Message -----
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To: <alt-photo-process-l@sask.usask.ca>
Sent: Thursday, July 15, 2004 4:52 AM
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 15:06:29 2004