lili krakowski on sun 24 jan 10
As I know nothing about computerized kilns etc I can only suggest you =3D
lower the alumina content of the glaze.
Copper =
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per(says =3D
Fournier) tends to volatilize. He also say copper carb will decompose in =
=3D
hot water...just a minimal point in case you mix your glazes in hot =3D
water--and I have no idea what the decomposition would lead to.
Cooper ("Electric Kiln Pottery") says that copper starts to volatilize =3D
at around 1922 F (around c.04) and I have no idea whether your cooling =3D
cycle can affect that...
Calculations by GlazeMasterT
www.masteringglazes.com
Your glaze:
.153 Na2O
.015 K2O
.006 MgO
.826 CaO
1.000 Total
.304 Al2O3
.266 B2O3
.004 Fe2O3
3.363 SiO2
So, following instinct (duh!)
21 Whiting
28.7 Frit--Ferro 3195
16.6 Kaolin--EPK
9.5 Frit--Ferro 3110
24.1 Silica
.158 Na2O
.009 K2O
.008 MgO
.825 CaO
1.000 Total
.297 Al2O3
.303 B2O3
.003 Fe2O3
2.612 SiO2
I would expect the lowering of Alumina and raising of B203 to help =3D
matters. If it crazes you can try calcined kaolin and some 2-3% =3D
bentonite.=3D20
Lettuce know.
.
Lili Krakowski
Be of good courage
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