Ned Ludd on wed 27 mar 02
>Ned to you have the recipe for this blue glaze? I'd like to test it. thx.
>lindsay
Voila:
Glaze name: Coleman Royal Cobalt (note: modified to remove 3% Zinc
Oxide. If you want that back in just recalculate the percentage. --
sorry, don't have the book with me to quote the original numbers.
I've tested it and vouch it's fine - in MY kiln. Usual disclaimers!
TEST first!
This from HyperGlaze. Go Mac!
Ned
Cone: 8 - 10
Color: Translucent Blue
Testing: Tested
Surface texture: Shiny or Glossy
Firing: Reduction
Glaze type:
Recipe: Percent (as good as)
Custer Feldspar 28.10
Whiting 24.00
EPK 19.79
Flint 28.10
Totals: 99.98
Also add:
cobalt carbonate 5.00
Comments:
left out 3% zinc oxide in original recipe, which is useless in reduction.
Possible Health Hazards:
Flint: free silica-wear a NIOSH approved dust mask when handling dry material
Unity Formula for Coleman Royal Cobalt TC-RC:
0.109 K2O 0.421 Al2O3 3.315 SiO2
0.049 Na2O 0.004 Fe2O3 0.003 TiO2
0.835 CaO 0.001 P2O5 7.9:1 Si:Al Ratio
0.007 MgO
Percentage Analysis for Coleman Royal Cobalt TC-RC:
65.61 % SiO2
14.14 % Al2O3
3.38 % K2O
1.00 % Na2O
15.43 % CaO
0.09 % MgO
0.21 % Fe2O3
0.05 % P2O5
0.08 % TiO2
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