Cindy Strnad on sun 8 apr 01
Tenmoku Gold ^6 Oxidation
=================
CORNWALL STONE...... 61.00 67.78%
WHITING............. 8.00 8.89%
GERSTLEY BORATE..... 3.00 3.33%
LITHIUM CARBONATE... 5.00 5.56%
DOLOMITE............ 7.00 7.78%
FLINT............... 6.00 6.67%
========
90.00
CaO 0.47* 10.84%
Li2O 0.21* 2.57%
MgO 0.13* 2.18%
K2O 0.09* 3.32%
Na2O 0.11* 2.75%
TiO2 0.00 0.12%
Al2O3 0.30 12.62%
B2O3 0.04 1.10%
SiO2 2.59 64.33%
Fe2O3 0.00 0.16%
Cost/kg 3.74
Si:Al 8.65
SiB:Al 8.78
Expan 7.12
I got this one from www.frogpondpottery.com , where its leaching properties
are expounded upon. Remember these figures are only accurate under the
conditions used by the firer of the actual pieces which were tested.
This glaze test yielded a gorgeous shiny brown to dark brown glaze with
floating gold flecks. I want to make more, but it does seem ridiculous for
me to be using such a large percentage of Cornwall Stone in a glaze as it's
mined so far from here. Any suggestions for possible U.S. substitutions?
Will be looking at the numbers for myself, of course, but if anyone has done
this already, I'd be grateful to hear.
Cindy Strnad
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
USA
earthenv@gwtc.net
http://www.earthenvesselssd.com
bivaletz ginny on mon 9 apr 01
--- Cindy Strnad wrote:
> Tenmoku Gold ^6 Oxidation
>
> =================
> CORNWALL STONE...... 61.00 67.78%
> WHITING............. 8.00 8.89%
> GERSTLEY BORATE..... 3.00 3.33%
> LITHIUM CARBONATE... 5.00 5.56%
> DOLOMITE............ 7.00 7.78%
> FLINT............... 6.00 6.67%
> ========
> 90.00
>
> CaO 0.47* 10.84%
> Li2O 0.21* 2.57%
> MgO 0.13* 2.18%
> K2O 0.09* 3.32%
> Na2O 0.11* 2.75%
> TiO2 0.00 0.12%
> Al2O3 0.30 12.62%
> B2O3 0.04 1.10%
> SiO2 2.59 64.33%
> Fe2O3 0.00 0.16%
>
> Cost/kg 3.74
> Si:Al 8.65
> SiB:Al 8.78
> Expan 7.12
>
> I got this one from www.frogpondpottery.com , where
> its leaching properties
> are expounded upon. Remember these figures are only
> accurate under the
> conditions used by the firer of the actual pieces
> which were tested.
>
> This glaze test yielded a gorgeous shiny brown to
> dark brown glaze with
> floating gold flecks. I want to make more, but it
> does seem ridiculous for
> me to be using such a large percentage of Cornwall
> Stone in a glaze as it's
> mined so far from here. Any suggestions for possible
> U.S. substitutions?
> Will be looking at the numbers for myself, of
> course, but if anyone has done
> this already, I'd be grateful to hear.
>
> Cindy Strnad
> Earthen Vessels Pottery
> RR 1, Box 51
> Custer, SD 57730
> USA
> earthenv@gwtc.net
> http://www.earthenvesselssd.com
>
>
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bivaletz ginny on mon 9 apr 01
cindy - posted in the archives is a substitution for
cornwall stone: potash spar 67
silica 22
kaolin 11
i copied this down awhile ago always meaning to test
it and never got around to it. i remember reading
that the results were better than the cornwall.
the archives has a whole load of posts on cornwall
stone. good luck.
=====
ginny from orcas island, washington.
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