Copper Red/Green

My previous copper red work:

January 2019 copper red

January 2019 copper red again

February 2019 copper red

March 2019 copper red with blue

Here I show a number of almost copper red glazes. Inspite of substantially thick glaze application, these glazes all show irregular green markings,
and are pale green where not red.

The baggs_Littlefield and Tichane family of glazes have low viscosity, high alkali metals, and contain Boron. In appearance,
kangxi-cu-red-Z1E-0 belongs to this family of low viscosity unevenly colored glazes, so is shown here.

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.

Clay body is a grolleg porcelain from Tacoma Clay Art Center.

glaze compositions

Empirical Formula glaze baggs_Littlefield_Z1D_0 :

K2O        .27
Na2O        .31
CaO        .35
MgO        .02
ZnO        .05

Al2O3 .45
B2O3 .20

SiO2 3.9
SnO2 .02

molecular percent Silica 70%

I added 1% silicon Carbide and 1% Copper Carbonate to the above glazes

Empirical Formula glaze baggs_Littlefield_Z1D_1 :

K2O        .23
Na2O        .34
CaO        .36
MgO        .02
ZnO        .05

Al2O3 .4
B2O3 .11

SiO2 3.9
SnO2 .02

molecular percent Silica 72%

I added 1% silicon Carbide and 1% Copper Carbonate to the above glazes

Empirical Formula glaze tichane_Z1D_0 :

K2O        .2
Na2O        .24
Li2O        .15
CaO        .35
MgO        .02
ZnO        .04

Al2O3 .34

SiO2 4
SnO2 .05

molecular percent Silica 73%

I added 1% silicon Carbide and 1% Copper Carbonate to the above glaze

Empirical Formula glaze tichane_Z1D_1 :

K2O        .2
Na2O        .17
Li2O        .16
CaO        .41
MgO        .01
ZnO        .05

Al2O3 .42
B2O3 .18

SiO2 4.17
SnO2 .05

molecular percent Silica 72%

I added 1% silicon Carbide and 1% Copper Carbonate to the above glaze

Empirical Formula glaze tichane_Z1D_2 :

K2O        .19
Na2O        .26
Li2O        .15
CaO        .35
MgO        .01
ZnO        .04

Al2O3 .33
B2O3 .18

SiO2 3.76
SnO2 .05

molecular percent Silica 71%

I added 1% silicon Carbide and 1% Copper Carbonate to the above glaze

Empirical Formula glaze kangxi-cu-red-Z1E-0 :

K2O        .11
Na2O        .19
CaO        .63
MgO        .02
ZnO        .04

Al2O3 .44

SiO2 3.6
SnO2 .02

molecular percent Silica 71%

I added 1% silicon Carbide and 1% Copper Carbonate to the above glaze

bowls are ~ 4 inches in diameter

glaze baggs_Littlefield_Z1D_0

full view

glaze baggs_Littlefield_Z1D_1

full view

glaze tichane_Z1D_0

full view

glaze tichane_Z1D_1

full view

glaze tichane-Z1D-2

full view

glaze kangxi-cu-red-Z1E-0

full view

Carol's Home Page