Lili Krakowski on tue 30 jan 07
Judd: I know no real answer. Sorry about that. In small quantities in the
glaze the zinc acts as a not-very-powerful flux and you could make tests
using calcium instead. In larger quantities , ten, twenty percent, the zinc
not only acts as flux, but creates typical crystals affecting the surface
and the look--a particular skim milk white. In the larger quantities the
zinc also will have an effect on certain colors. The best suggestion I can
think of (no folks I do not think Judd will save if he changes to a zinc
containing frit) is to make blends and see how much calcium will replace how
much zinc without losing the sought after characteristics of the glaze.
Lili Krakowski
Be of good courage
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