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golden fake ash

updated mon 29 oct 01


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%
DOLOMITE............ 25.00 24.75%
GERSTLEY BORATE..... 10.00 9.90%

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

Michelle McCurdy on fri 26 oct 01

reduction or oxidation??

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

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
A good glaze, I thought, on a piece of sculpture.

Thanks once again to clayart.