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:
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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
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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
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