Copper Red
My first copper red was seen here:
Here is my next step, with thicker glaze application, and glazes which are not overfired.
I show a variant of the glaze baggs-Littlefield. I also show a modification of a glaze given by Nigel Wood in "Chineese Glazes".
The local reduction is produced by the inclusion of 1 % of 1000 mesh silicon
carbide in the glaze recipe.
These glazes, as all my glazes, are mixed with CMC gum which aids in
maintaining the silicon carbide in suspension.
cone 10 oxidation
Firing profile
Up Fire profile
150 deg F an hour to 250 deg F
400 deg F an hour to 2050 deg F
120 deg F an hour to 2250 deg F
60 deg F an hour to 2310 deg F with a hold of 20 minutes at 2310 deg F
Down Fire Profile
A half hour hold at 1750 deg F
A three hour hold at 1700 deg F
slow downfire at 25 deg F an hour in the interval 1700 deg F to 1650 deg F
A one hour hold at 1650 deg F
The cones show this as a cone 10 firing.
K2O .27
Al2O3 .58
SiO2 3.8
molecular percent Silica 67
This glaze is derived from baggs-Littlefield by decreasing the Boron.
I added 1 % silicon Carbide and 1 % Copper Carbonate to the above
K2O .08
Al2O3 .5
SiO2 3.26
molecular percent Silica 68 %
I added 1 % silicon Carbide and 1 % Copper Carbonate to the above.
This glaze is derived from a glaze given by Nigel Wood in Table 72
of chapter 9 in his book "Chineese Glazes".
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
glaze compositions
Empirical Formula glaze baggs-Littlefield_Z1B_0 :
Na2O .3
CaO .37
MgO .01
ZnO .05
B2O3 .25
SnO2 .03
Empirical Formula glaze Kangxi-cu-red-0 :
Na2O .17
CaO .69
MgO .02
ZnO .04
SnO2 .02
bowls are ~ 4 inches in diameter
glaze baggs-Littlefield_Z1B_0
glaze kangxi-cu-red-0
inside of bowl
outside of bowl