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Semantics in Ceramics
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Ceramics 101
Semantics in Ceramics
It has come to our attention that many new ceramists
are confused by some of the words in our 'ceramics language'. They think
applying a clear glaze over an underglaze is using an overglaze. Or they think
they need to apply clear glaze over a colored glaze to 'finish' it. We thought
we would try to help clear up the confusion and help everyone understand how
important it is to use the proper words when asking for help with a product.
Underglaze - Painted on greenware or bisque, this
product goes UNDER the glaze, hence the name underglaze. On greenware the piece
must be fired to cone 04 before glazing. On bisque, apply clear glaze over the
underglaze and fire to 06.
Glaze - Painted on bisque
either on its own or over an underglaze. This can be a colored glaze covering
an entire piece of bisque or a clear glaze covering an underglaze. After
application glaze is fired to cone 06. A clear glaze which is applied
over an underglaze is called clear glaze, not overglaze! And, you do
NOT need to apply a clear glaze over a GLAZE to 'finish' it.
Overglaze - This is a special third fire product,
which is applied OVER your fired glazed ceramic item. You should not apply
Mother of Pearl or fired Gold over unglazed bisque. Overglazes fire to a cooler
cone temperature than glazes. The cone used varies with the product so be sure
to read the instructions carefully before beginning.
It is so
simple once you know - underglaze goes under a glaze, as the name implies.
Glaze is applied to bisque. Overglaze is a special product that is applied over
your fired glaze then fired to a special lower cone.
If you aren't sure
about a product, read the label. It will say if the product is a glaze or an
underglaze, it will explain application and even tell you what cone to use for
firing.
If you have any questions about other confusing ceramic words,
or if this didn't clear it up for you, please let us know and we'll include the
explanation in a future newsletter.
Glossary - Ceramics 101
Simple, Secure, Convenient - Creative Glazes.
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