Re: Gum Pigments

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From: Mike Hopper (mikehopper@rogers.com)
Date: 07/26/03-11:16:29 AM Z

----- Original Message -----
From: "Judy Seigel" <jseigel@panix.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Saturday, July 26, 2003 12:25 PM
Subject: Re: Gum Pigments

>
>
> On Sat, 26 Jul 2003, Judy Seigel wrote:
> >.... I can attest that there are brands that do not not
> > not NOT work.... Generally these are not the major international brands
> > (Winsor Newton, Rowney, etc., and now Daniel Smith) tho there are
> ...etc.
>
>
> Reading now at about the 125 mark I see I should clarify what I mean by
> "brands that do not work" ... That is, they will not clear, no matter what
> else you do or don't do they will NOT NOT NOT clear.
>
> I suspect, tho I cannot prove (nor do I need to) that there are some
> dispersal or similar agents added to these brands, perhaps to make the
> cheaper ingredients flow. When I tried adding a pure dispersal agent to
> gum emulsion, the effect was similar.
>
> J.
>

Judy

Just for clarification; what sort of material are you defining as a
dispersal agent? Is it a natural or synthetic surfactant? A polymer like a
gum (natural product) or a synthetic polymeric dispersant such as those used
in aqueous lithographic printing inks?

mike

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