Ryuji,
I have sodium carbonate and borax in my hands (both are alkalis right?)
and want to harden with formaldehyde.
How much formalin and alkali should I add to 1lt water for an effective
and fast working hardening bath?
TIA,
Loris.
-----Original Message-----
From: Ryuji Suzuki [mailto:rs@silvergrain.org]
Sent: 14 Ocak 2006 Cumartesi 11:56
To: alt-photo-process-l@sask.usask.ca
Subject: Re: Glyoxal?
...
Hardening reaction of formaldehyde-gelatin mix is highly pH dependent.
Below pH of 5, hardening is very slow, but it is much faster around and
above 8. It is very well known and very well documented.
Glut is somewhat pH sensitive but it is an excellent hardener in a much
wider window of pH value so in practice the users need not worry:
another advantage of glut.
...
Received on Mon Jan 16 06:15:37 2006
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