Autumn Downey on mon 18 feb 08
This recipe from our Guild has been used for many years. It's glossy, good at cone 5, runs sometimes in combination with some other glazes and usually looks a bit richer on red clay. I guess, since we are close to the end of our GB, we'll be trying it with Boraq sometime soon.
GB Turquoise
Code Number:
=========================================
CUSTER FELDSPAR............. 2100.00
FLINT....................... 1150.00
WHITING..................... 150.00
GERSTLEY BORATE 99.......... 850.00
BALL CLAY................... 150.00
ZINC OXIDE.................. 400.00
TALC........................ 200.00
COPPER CARBONATE............ 150.00
=========
5150.00
CuO 0.07* 2.02 1.65
CaO 0.31* 6.17 7.19
MgO 0.10* 1.41 2.28
K2O 0.14* 4.54 3.15
Na2O 0.08* 1.82 1.92
ZnO 0.29* 8.37 6.72
TiO2 0.00 0.05 0.04
Al2O3 0.28 9.89 6.34
B2O3 0.19 4.68 4.39
SiO2 2.89 60.96 66.28
Fe2O3 0.00 0.08 0.03
Cost: 2.37
Calculated LOI: 7.18
Imposed LOI:
Si:Al: 10.46
SiB:Al: 11.15
Thermal Expansion: 6.87
Formula Weight: 285.20
Date: 26/11/2007
ID: 209
Location:
Typecodes: GUI
URL:
Notes
Glaze sometimes runs in double dips.
Autumn Downey
Ron Roy on sat 23 feb 08
Hi Autumn,
Here it is with 3134 instead of GB - I'll bet it's really close - let me
know if it needs some adjustments.
If you try it with 5 or 6 % rutile I'll bet it will be durable as well.
CUSTER SPAR......... 28.50
SILICA.............. 21.00
WHITING............. 2.50
F3134............... 19.00
OM-4................ 16.50
ZINC OXIDE.......... 8.50
TALC................ 4.00
+coppr carb.......... 3.00
----------
103.00
RR
>This recipe from our Guild has been used for many years. It's glossy,
>good at cone 5, runs sometimes in combination with some other glazes and
>usually looks a bit richer on red clay. I guess, since we are close to
>the end of our GB, we'll be trying it with Boraq sometime soon.
>
> GB Turquoise
> Code Number:
> =========================================
>
> CUSTER FELDSPAR............. 2100.00
> FLINT....................... 1150.00
> WHITING..................... 150.00
> GERSTLEY BORATE 99.......... 850.00
> BALL CLAY................... 150.00
> ZINC OXIDE.................. 400.00
> TALC........................ 200.00
> COPPER CARBONATE............ 150.00
> =========
> 5150.00
>
> CuO 0.07* 2.02 1.65
> CaO 0.31* 6.17 7.19
> MgO 0.10* 1.41 2.28
> K2O 0.14* 4.54 3.15
> Na2O 0.08* 1.82 1.92
> ZnO 0.29* 8.37 6.72
> TiO2 0.00 0.05 0.04
> Al2O3 0.28 9.89 6.34
> B2O3 0.19 4.68 4.39
> SiO2 2.89 60.96 66.28
> Fe2O3 0.00 0.08 0.03
>
> Cost: 2.37
> Calculated LOI: 7.18
> Imposed LOI:
> Si:Al: 10.46
> SiB:Al: 11.15
> Thermal Expansion: 6.87
> Formula Weight: 285.20
>
>
> Date: 26/11/2007
> ID: 209
> Location:
> Typecodes: GUI
>
> URL:
>
> Notes
> Glaze sometimes runs in double dips.
>
>Autumn Downey
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
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