U of S | Mailing List Archive | alt-photo-process-l | Re: Gum and photogravures

Re: Gum and photogravures

Loris, perhaps you took my analogy about a beetle in amber too
literally (see below). I use that analogy to help people picture
how pigment figures into the crosslinked gum matrix, but when I say
it's like a beetle in amber, I simply mean that in both cases,
something is encased within a hardened material, not that the
hardened material is the same in both cases. By the same token,
when I said to a friend this morning that I'm "sitting like a bump on
a log" I meant simply that like the bump on the log, I'm stationary
and attached to what I'm sitting on, not that I am made of wood fibres.

On Nov 16, 2008, at 1:08 PM, me@ronniebphotography.com wrote:

-------- 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
Sap is the fluid that circulates through a plant's vascular system,
resin is the semi-solid amorphous organic substance secreted in
and canals through epithelial cells of the plant..."

So, eventually gum and amber are quite different.


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