Jeff Lawrence on fri 24 oct 97
Suzanne Storer was interested in this tasty glaze, so here is an Insight
printout from that glaze. It fits a body that is about 50/50 ball clay and
talc. I suspect it will shiver on a more plastic body, but tinker away.
Alas, it suffers from serious boracity of gerstley...
Best regards,
Jeff
04 yellow iron -- 04MUSTRD.RCP
=============
GERSTLEY BORATE..... 38.00 37.81%
LITHIUM CARBONATE... 7.50 7.46%
NEPHELINE SYENITE... 9.00 8.96%
EPK KAOLIN.......... 5.00 4.98%
FLINT............... 38.00 37.81%
*iron oxide yellow... 3.00 2.99%
========
100.50
CaO 0.39* 7.69%
Li2O 0.35* 3.62%
MgO 0.00* 0.02%
K2O 0.02* 0.52%
Na2O 0.24* 5.26%
Fe2O3 0.00 0.04%
TiO2 0.00 0.02%
B2O3 0.97 23.58%
Al2O3 0.13 4.78%
SiO2 2.60 54.49%
Cost/kg 1.85
Si:Al 19.35
SiB:Al 26.58
Expan 6.54
Notes: Fired to 04 in electric kilns.
Good: excellent maturation with very flat matte surface; muted mustard
yellow with red speckies -- an inviting, interesting color.
Bad: shows utensil marks quite a bit; dry and red where thin.
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