U of S | Mailing List Archive | alt-photo-process-l | Re: Gum and Photogravure, was: varnishes

Re: Gum and Photogravure, was: varnishes

Jon, a gum print should be considered equivalent to a carbon print,
in other words there is no logical reason to suppose that a carbon
print is more stable than a gum print. So if a carbon print is more
stable than a photogravure (a question I would have no opinion about)
then so would a gum print be.

On Nov 15, 2008, at 3:19 PM, Jon Lybrook wrote:

I agree. Thanks Loris. And yes, the best oil-based etching inks
are made from linseed.

I believe you are right about carbon, from what little I know about
it, but is there any evidence to support the idea that a gum print
is more stable than an oil painting (or oil-based photogravure print)?


Loris Medici wrote:
15 Kasım 2008, Cumartesi, 9:30 pm tarihinde, Jon Lybrook yazmış:
... Oil based ink on cotton rag or alpha cellulose paper is
essentially pH neutral anyway, isn't it? ...
Shouldn't be if it's the same oil (linseed oil) they use in oil
painting... But of course since it's a lot stiffer than regular
oil paints it should have much less oil. Anyway, the oil (and
acid) is still there. So, I wouldn't consider a photogravure print
as archival as say a carbon or gum print made with non-fugitive
pigments. But probably the comparison is moot - only a
consideration for historians... Regards, Loris.
-- Jon Lybrook Intaglio Editions http://intaglioeditions.com