Cindy Strnad on sun 8 apr 01
Teal Blue ^6
J. Deboo
======================
NEPHELINE SYENITE... 30.00 28.57%
FLINT............... 21.00 20.00%
WHITING............. 8.00 7.62%
FRIT 3134........... 10.00 9.52%
OM #4 BALL CLAY..... 31.00 29.52%
ZIRCOPAX............ 4.00 3.81%
*Copper Carbonate.... 1.00 0.95%
========
105.00
CaO 0.59* 7.75%
MgO 0.01* 0.14%
K2O 0.08* 1.83%
Na2O 0.31* 4.50%
TiO2 0.02 0.39%
ZrO2 0.10 2.80%
Al2O3 0.69 16.41%
B2O3 0.15 2.41%
SiO2 4.51 63.38%
Fe2O3 0.01 0.38%
Cost/kg 1.21
Si:Al 6.55
SiB:Al 6.77
Expan 6.99
The original recipe, as posted by Alisa, called for Tin, 2%. I was all out
of tin, so I used Zircopax 4%. Like her, I got a semi-matte glaze. Alisa got
a yellow matte ground where the glaze was thin. I got fairly uniform color,
but so light as to be more of a cool white than a turquoise. Possibly this
is because I used zircopax rather than tin, however I don't care for the
"hand" of this glaze enough to go on to trying tin instead, or more copper,
or other colorants. My sample is covered with very tiny pinholes, so I don't
think I'll go any farther with this one.
Cindy Strnad
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
USA
earthenv@gwtc.net
http://www.earthenvesselssd.com
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