Pursuit of Tenmoku
The desire for a mirror black tenmoku with metallic bronze edge at rim, in
cone 10 oxidation, is a dream
Here I show my progress to date. In the land of glazes, I have found a region
of high alkali metal, and moderately
The next three glaze are non-tenmokus from this region; Each a small
variation of one of the above tenmokus.
The last glaze is not a tenmoku; it is of a different family, yet it is black,
not brown, indicating that tenmokus
The bowls are ~3.5 inches in diameter, the mug ~4.5 inches high.
150 deg F an hour to 250 deg F
400 deg F an hour to 1800 deg F
300 deg F an hour to 2050 deg F
120 deg F an hour to 2310 deg F with a hold of 20 minutes at 2310 deg F
300 deg F an hour to 1750 deg F then a half hour hold at 1750 deg F
300 deg F an hour to 1700 deg F then a Three hour hold at 1700 deg F
25 deg F an hour to 1650 deg F then a one hour hold at 1650 deg F
K2O 0.15
Al2O3 0.71
SiO2 4.0
molecular percent Silica 67.6%
K2O 0.16
Al2O3 0.71
SiO2 4.2
molecular percent Silica 68.6%
K2O 0.18
Al2O3 0.67
SiO2 3.86
molecular percent Silica 67.3%
K2O 0.15
Al2O3 0.79
SiO2 4.1
molecular percent Silica 67.2%
K2O 0.21
Al2O3 0.61
SiO2 3.8
molecular percent Silica 67.5%
K2O 0.20
Al2O3 0.66
SiO2 4.1
molecular percent Silica 68.2%
K2O 0.11
Al2O3 0.66
SiO2 3.7
molecular percent Silica 66.3%
K2O 0.11
Al2O3 0.75
SiO2 3.89
molecular percent Silica 66.3%
K2O 0.21
Al2O3 0.60
SiO2 4.3
molecular percent Silica 70.3%
K2O 0.20
Al2O3 0.54
SiO2 5.0
molecular percent Silica 73.6%
K2O 0.10
Al2O3 0.66
SiO2 3.4
molecular percent Silica 64.4%
K2O 0.22
Al2O3 0.82
SiO2 5.4
molecular percent Silica 72.4%
I've long had and now pursuing.
high alumina glazes, containing
tenmoku glazes. The first eight glazes shown are tenmokus from this region.
Thus, while there are many tenmokus in
the region identified, not all the glazes in this region are tenmokus. That
region
is much too broadly defined to expect that all the glazes within would
have similar properties.
are likely found in regions other
than the high alkali metal, high alumina region I have primarily
been investigating.
Image of the glaze iron_mashiko_satIron_Z2Y
inside
Image of the glaze iron_mashiko_satIron_Z2Y_PSi
inside
Image of the glaze iron_mashiko_satIron_Z2Z
inside
Image of the glaze iron_mashiko_satIron_Z30
inside
Image of the glaze iron_satIron_Z2W_0
inside
Image of the glaze iron_satIron_Z2W_0PAlSi
outside
Image of the glaze iron_satIron_Z2W_Z2Y_0
inside
Image of the glaze iron_satIron_Z2W_Z2Z_1
inside
The near misses - the non Tenmoku glazes
Image of the glaze iron_satIron_Z2W_0PSi
inside
Image of the glaze iron_satIron_Z2W_0PSi_MAl
outside
Image of the glaze iron_satIron_Z2W_Z2Z_0
inside
Image of the glaze mashiko_satIron_Z2Y
inside
oxidation firing to cone 10 in an electric kiln
Firing profiles
Up Fire profile
Down Fire Profile
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
glaze compositions
Empirical Formula iron_mashiko_satIron_Z2Y :
Na2O 0.36
Li2O 0.21
CaO 0.12
MgO 0.16
Fe2O3 0.21
Empirical Formula iron_mashiko_satIron_Z2Y_PSi:
Na2O 0.35
Li2O 0.21
CaO 0.12
MgO 0.16
Fe2O3 0.22
Empirical Formula iron_mashiko_satIron_Z2Z:
Na2O 0.38
Li2O 0.26
CaO 0.05
MgO 0.13
Fe2O3 0.21
Empirical Formula iron_mashiko_satIron_Z30:
Na2O 0.37
Li2O 0.22
CaO 0.12
MgO 0.14
Fe2O3 0.21
Empirical Formula iron_satIron_Z2W_0:
Na2O 0.41
Li2O 0.27
CaO 0.04
MgO 0.07
Fe2O3 0.23
Empirical Formula iron_satIron_Z2W_0PAlSi:
Na2O 0.39
Li2O 0.29
CaO 0.04
MgO 0.08
Fe2O3 0.24
Empirical Formula iron_satIron_Z2W_Z2Y_0:
Na2O 0.48
Li2O 0.28
CaO 0.02
MgO 0.11
Fe2O3 0.24
Empirical Formula iron_satIron_Z2W_Z2Z_1:
Na2O 0.51
Li2O 0.26
CaO 0.02
MgO 0.10
Fe2O3 0.22
Empirical Formula iron_satIron_Z2W_0PSi:
Na2O 0.39
Li2O 0.29
CaO 0.04
MgO 0.07
Fe2O3 0.22
Empirical Formula iron_satIron_Z2W_0PSi_MAl:
Na2O 0.35
Li2O 0.32
CaO 0.04
MgO 0.09
Fe2O3 0.27
Empirical Formula iron_satIron_Z2W_Z2Z_0:
Na2O 0.50
Li2O 0.26
CaO 0.03
MgO 0.11
Fe2O3 0.22
Empirical Formula mashiko_satIron_Z2Y:
Na2O 0.18
Li2O 0.15
CaO 0.23
MgO 0.22
Fe2O3 0.19