AFAIK (after some web browsing), gelatine will retain 95% of its gelling
power even after kept in a solution temperature of 50-60C for one hour (I
kept the gelatine solution at 50C for not more than 10 minutes)... Many
other resources on emulsion making and sizing state a temperature around
50-55C. Since gelatine's melting point is about 40C, I don't think an extra
10C would be so harmful to it...
Loris.
_____
From: TERRYAKING@aol.com [mailto:TERRYAKING@aol.com]
Sent: 13 Temmuz 2006 Perşembe 09:57
To: alt-photo-process-l@usask.ca
Subject: Re: Watercolor pigments - pigments to avoid...
In a message dated 12/07/2006 20:58:12 GMT Daylight Time,
mail@loris.medici.name writes:
- Prepared a 2% gelatine solution (200 Bloom, 15 mins. soak, then heated to
50C and stirred)
- Brushed the solution to a paper evenly, I even made few passes with a
glass coating rod
- Dried the paper
- Hardened (outside) with a formalin solution (15cc to 1.5lt water) time:
2mins (*)
Loris
You heated the gelatine to a point where you destroyed its qualities as a
size..
Forget the formalin.
Terry
Received on 07/13/06-02:10:26 AM Z
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