Les Crimp on wed 4 apr 01
I can use some advice ( maybe Vince can help) on how to apply a slip =
over a glaze as a decoration. What I have done is bisque a sushi set, =
dipped it in glaze and then applied the white slip over the glaze in =
straight lines as a decoration.
The result is that the slip dried so rapidly it literally fell off the =
glaze. Obviously my formulation for my slip is out of whack - probably =
too much clay which causees it to dry too fast.
If anyone "out there" can give me some advice or the formula for a =
non-drying slip that will fire at ^10 in a wood-fired kiln and still =
stay as a discernable (white) straight line after firing I would greatly =
appreciate the help.
Les Crimp on that Island in the Pacific.
lcrimp@home.com
vince pitelka on thu 5 apr 01
I can use some advice ( maybe Vince can help) on how to apply a slip over a
glaze as a decoration. What I have done is bisque a sushi set, dipped it in
glaze and then applied the white slip over the glaze in straight lines as a
decoration.
Les -
Tell me more about why you want to do this. It is an unconventional method
because slip is almost never applied overglaze. There are some Ming or
Ching Dynasty Chinese pots which have a thin slip or clay image "floating"
on the surface of the glaze, and in contemporary Clay the late Bob Sperry
was well known for the "controlled crawl" effects of his large black and
white platters (such as the beautiful one in the Mint Museum in Charlotte),
where white slip was applied over a black glaze. As I generally define it,
a slip is just a clay or claybody mixed to liquid consistency. I think of
an engobe as a special slip mixed for application to bone-dry or
bisque-fired pots wares. Maybe that is what you are seeking. If you indeed
have a good reason for applying slip over your glaze, and if your slip is
peeling off the glaze surface, I would replace half the clay content with
calcined kaolin. That should make your slip work over the glaze. But if
you are looking for clean lines that don't move around in the firing, you
might just consider using commercial underglaze. It should stick with no
problems. But then I would have to ask, why apply them overglaze rather
than underglaze?
Best wishes -
- Vince
Vince Pitelka
Appalachian Center for Crafts
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Home - vpitelka@dtccom.net
615/597-5376
Work - wpitelka@tntech.edu
615/597-6801 ext. 111, fax 615/597-6803
http://www.craftcenter.tntech.edu/
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