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-------- Original Message --------
Subject: Re: Gum and Photogravure, was: varnishes
From: Loris Medici <mail@loris.medici.name>
Date: Sun, November 16, 2008 2:04 pm
To: alt-photo-process-l@usask.ca

16 Kasım 2008, Pazar, 10:11 pm tarihinde, Loris Medici yazmış:
> ...
> On the other hand you used a nice description "...like a beetle in
> amber...", since we know that they're beetles fossilized in amber as old
> as millions of years, maybe there isn't much difference between amber and
> gum (both being sap of their particular trees) so we can pretty be
> confident that gum prints could be quite stable. No?

Wikipedia article on amber says:
"...A common misconception is that amber is made of tree sap; it is not.
Sap is the fluid that circulates through a plant's vascular system, while
resin is the semi-solid amorphous organic substance secreted in pockets
and canals through epithelial cells of the plant..."

So, eventually gum and amber are quite different.