Re: types of gum

After this discussion, i made a point of checking all the bottles of wWinsor
& Newton gum when I went to get some - every bottle was a different colour -
as they're in clear glass, this would make sense. However the gum I mix
myself from pure gum acacia seems darker than the bottled gum - go
figure.......

Kate Mahoney
----- Original Message -----
From: "Judy Seigel" <jseigel@panix.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Thursday, November 20, 2003 4:34 PM
Subject: Re: types of gum

>
> On Wed, 19 Nov 2003, pete wrote:
>
> > Judy,
> > Thanks very much, I understand now, the old grey cells are beginning to
> > shrivel.
> > When I was in Australia about ten years ago I used a local gum provided
by
> > John Pollard, it worked very sweetly I will try and get the name for
you.
>
> I'd love the name, if not necessarily the game.... I don't mind admitting
> I'm a gum junky... in fact eagerly await a sample of a certain antique gum
> I've been promised. But I suspect I may be a peasant in the matter,
> having liked probably half the prepared liquid gums I've tried, and NOT A
> PROBLEM when they're dark. In my tests the final color with a dark gum is
> barely if at all different from that with a light gum. In fact I suspect
> that this discussion may be convincing non-gummists that all bottled
> liquid is dubious. That, I stress, is not the case... I've liked most of
> them more than home mixed.
>
> I'll add though that I've noticed in the past year that gums stored in
> glass darkened with time... I think they may oxidize in the light, as
> Gamblin galkyd did. I have a glass bottle of Galkyd varnish that in two
> years on the shelf turned from pale amber to dark brown. Having noticed
> this, and also seeing a LOT of brown deposit on the bottom of gallon jugs
> of gum that sat around for a while, i suspect that gum color may be
> related more to age than impurities (or other).
>
> Again, I myself don't really care. I like the convenience and don't find
> the dark a problem. But for those who do care... mixing your own makes a
> very light gum. Whether it darkens in time... I dunno.
>
> Judy
>
>
Received on Thu Nov 20 01:30:49 2003