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  1. [Baren 42308] Re: Natural Pigments (George O'Hanlon)
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Message 1
From: George O'Hanlon
Date: Sat, 06 Nov 2010 19:14:46 GMT
Subject: [Baren 42308] Re: Natural Pigments
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I will answer questions from various posters in this message:

Diane Cutter: What are the differences between oil paint and printing ink? I
am of the opinion that it has to do with the amount of oil in the mix, more
in fine oil paints, less in printer's ink. Is this true?

The difference lies in the overall formulation, such as the ratio of binder
(oil) to pigment, as you surmised, the type of oil (primarily bodied or
polymerized oil in printing inks) and formulation (driers, wetting agents,
etc.) Bodied or polymerized oils are essential, because they improve the
flow out and leveling of the ink. They are not typically used in artistsą
oil colors. Wetting agents are important in ink to improve the wetting of
the substrate such as paper. Although linseed oil was the primary oil used
in printing inks before the 20th century, it has largely been replaced by
soy oils and other oils that yellow less than linseed oil.

David Bull: What are in aqueous pigment dispersions?

First, I did not think badly, David, about your comment. Pigment dispersions
made by Natural Pigments contain purified water and pigment with a small
amount of other ingredients that are less than five percent of the entire
formulation. These ingredients include a natural gum and natural or
naturally-derived biocides used in cosmetics. The biocides are present to
prevent spoilage and the gum is added to prevent separation and freezing
when exposed to the harsher environments.

I welcome questions about pigments, paints and inks from members of this
discussion group.

George O'Hanlon
Technical Director
Natural Pigments LLC
Phone: 707-459-9998
Fax: 408-516-9442

Mailing Address:
PO Box 112
Willits, CA 95490
United States of America