From: Keith Gerling (email@example.com)
Date: 02/26/03-08:32:11 AM Z
One other point -- Keith Gerling was frustrated trying to do a gum coat in
white... Different white pigments are different. As I recall Ralph Mayer's
rundown, zinc white is the most transparent. ("chinese white" is zinc
white.) Titanium has the most opacity, and I've had some good solid white
coats with it when I wanted to cover something or otherwise get special
effect with a layer of solid white. There were some reasons it isn't
desirable for all oil painting purposes. (Don't expect me to remember from
50 years ago, but it may have been that it's brittle in pure paint, which
would NOT be an issue in a gum layer.)
There's also lead white, which i doubt you can get any more ("flake" white
in oil paint), but it yellows over time & I don't know how it would be
with dichromate anyway.
I've tried many whites. In fact, I bought just about every white thing
Pearl had: gouache, dry pigments, Createx, Mixol (I think, Mixol). Some of
these produced very nice, dense layers. BUT, they turned gray when they
dried. I tried many many coats. The gum layer didn't look transparent.
In fact the black background was covered very nicely. The dried emulsion
just turned gray, an observation driven home when I scraped it off the black
aluminum and just LOOKED at it. BUT, it turned white again when it was
dampened. Who knows? Anyway, I finally gave up.
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