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gloss glaze vs. underglaze

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From: Marian Colman (colmans1_at_TeacherArtExchange)
Date: Tue Sep 30 2003 - 02:55:53 PDT

My students know the differences between underglaze and gloss glaze in
terms of their physical properties such as surface texture, degree of
opacity and stability etc. What I don't know how to explain to them is
what ingredient(s) make the 2 different. In other words, what is the
basic chemical difference in the 2 types of glaze? Is there more silica
in the gloss glaze? I am not a chemist but I am always trying to
understand these things! I could use some help to make it clear to my
students-- Thank you to anyone who can shed some light on this--( I
have searched in books but haven't found a good answer).
Marian 

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