Cindy Strnad on thu 25 oct 01
Dear Jody,
Do you want a real ash glaze, or would a glaze
that looks like an ash glaze do? Here's one I
really love, in case it will help you. It came
from Clayart.
Golden Fake Ash, ^6
===================
REDART.............. 29.00 28.71%
OM #4 BALL CLAY..... 21.00 20.79%
BONE ASH............ 5.00 4.95%
STRONTIUM CARBONATE. 9.00 8.91%
DOLOMITE............ 25.00 24.75%
GERSTLEY BORATE..... 10.00 9.90%
LITHIUM CARBONATE... 2.00 1.98%
========
101.00
CaO 0.45* 16.11%
Li2O 0.05* 1.04%
MgO 0.32* 8.16%
K2O 0.03* 1.81%
Na2O 0.02* 0.92%
SrO 0.12* 8.07%
TiO2 0.01 0.73%
Al2O3 0.21 13.37%
B2O3 0.08 3.72%
P2O5 0.03 3.01%
SiO2 1.05 40.13%
Fe2O3 0.03 2.94%
Cost/kg 1.24
Si:Al 5.09
SiB:Al 5.50
Expan 7.51
As you may note, it is low on silica. I haven't
experimented with raising the silica content, as I
want the glaze for non-functional surfaces, so I
don't know what that would do to it. Also, I don't
know how well subbing gerstley alternatives will
work, but Boraq is highly rated and might do the
trick just fine.
This is a gorgeous gold glaze with greenish
runnels. If you fire it too hot or too long, it
will run, but it isn't a real problem glaze as
long as you treat it respectfully.
Best wishes,
Cindy Strnad
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
USA
cindy@earthen-vessels-pottery.com
http://www.earthen-vessels-pottery.com
Michelle McCurdy on fri 26 oct 01
reduction or oxidation??
Thanks
Cindy Strnad on sat 27 oct 01
The golden fake ash glaze is an oxidation
glaze--maybe you could use it in reduction--I
haven't tried.
Cindy Strnad
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
USA
cindy@earthen-vessels-pottery.com
http://www.earthen-vessels-pottery.com
Joan Ashworth on sun 28 oct 01
To any South African potters wanting to try this glaze.
I used SA ball clay, and Ndebele terracotta clay.
It resulted in a matt, ochreish yellow brown with light green glassy
runnels.
A good glaze, I thought, on a piece of sculpture.
Thanks once again to clayart.
Joan
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