Cindy Strnad on sun 8 apr 01
Ron Roy's Black #3
Cone 6, Oxidation
=====================================
CUSTER FELDSPAR..... 22.00 19.47%
WHITING............. 4.00 3.54%
TALC................ 5.00 4.42%
FRIT 3134........... 26.00 23.01%
EPK KAOLIN.......... 17.00 15.04%
FLINT............... 26.00 23.01%
BENTOLITE L......... 2.00 1.77%
IRON OXIDE RED...... 9.00 7.96%
*Cobalt Carbonate.... 2.00 1.77%
========
113.00
CaO 0.55* 8.05%
MgO 0.16* 1.67%
K2O 0.09* 2.20%
Na2O 0.20* 3.15%
TiO2 0.00 0.07%
Al2O3 0.38 9.99%
B2O3 0.32 5.68%
P2O5 0.00 0.04%
SiO2 3.89 60.65%
Fe2O3 0.21 8.51%
Cost/kg 1.53
Si:Al 10.31
SiB:Al 11.14
Expan 7.18
I tried a different version of Ron's Black some time ago and got a
disappointing dark brown. A nicely melted and surfaced dark brown, but not
what I was looking for. John H. notes in his commentary of this glaze (
www.frogpondpottery.com ) that the increase of cobalt worked well, and I
agree with him.
I got a gorgeous shiny black, black, black. Thanks, Ron and John!
Cindy Strnad
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
USA
earthenv@gwtc.net
http://www.earthenvesselssd.com
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