Re: Adhesion

From: Etienne Garbaux ^lt;[email protected]>
Date: 02/18/05-09:08:10 PM Z
Message-id: <p05210600be3c545a43d1@[]>

In my previous post in this thread, I mentioned that gum bichromate, as
traditionally practiced, leaves unhardened gum between the hardened layers
and the support, so it is thought (apparently with some reason) that gum
depends on the physical tooth of a support -- which I described as "having
support fibers more or less throughout the depth of the coating" -- and
thus might be expected to work more easily with "woolly" papers than hot
pressed papers.

In a post I've misplaced, Judy noted that gum works fine for at least some
practitioners on smooth, "un-woolly" papers. She also noted that she tends
to use less viscous gum solutions than some gum printers.

I don't think we disagree. The important point is that there are support
fibers more or less throughout the thickness of the gum coating for the
hardened gum to hang onto. These needn't be woolly fuzz above the bulk of
the paper mass if the coating soaks into the paper, in which case there
*would* be support fibers more or less throughout the thickness of the gum
coating, notwithstanding that the paper was smooth and relatively
"toothless." Maybe the operative criterion is more porosity than
woolliness. Who knows -- maybe smooth filter paper soaked all the way
through with gum would make awsome prints?

Best regards,

Received on Mon Feb 21 12:11:01 2005

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