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Re: Favorite glazes

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From: Justin Kramer (justyn_at_TeacherArtExchange)
Date: Thu Apr 17 2003 - 15:32:32 PDT


In this thread someone mentioned the crackle glaze and dipping it in black
ink. Another way to achieve this effect is to "crack" the kiln - meaning to
open it allow the temperature to drop suddenly - around 350 C (sorry I
don't know the conversion temp.) This will make the glaze craze. If you do
this too high then the glaze may blister and peel back from the ceramic
body.

Does anyone else use a white slip coating applied when the clay is
leatherhead? I do this as the colours come out alot brighter - its similiar
to using watercolour on white paper instead of brown. The white slip is made
from white earthenware. A fork and water is the more economical way if you
don't have blender. Also the students generally clean up all joins and
unwanted rough textures when applying the slip. You can also use this for
sgraffitto on darker clay bodies like terracotta.

Another technique is glaze etching. You must use a dust mask for this. If
you scratch into the glaze pre-firing these lines generally are visuable
after firing.

Have you tried multiple firing. If you glaze, fire and then glaze again,
fire and then glaze again and fire you achieve some very interesting
effects. When applying the glaze try different approaches like stippling,
sponging, rubbing back, ragging, etc.

Justin in Brisvegas

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