Iron Yellow micro-crystalline glaze
Two nearby micro-crystalline iron yellow glazes, by which is meant similar
empirical formulae. The first,
The second alex-longuan-iron-shino-MLi-MAlk while fired to maturity, has
prominent markings which
bowl is ~ 4 inches in diameter.
bowl is ~ 4 inches in diameter
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 1850 deg F then a 2 hr hold at 1850 deg F
300 deg F an hour to 1750 deg F then a 1 hr hold at 1750 deg F
300 deg F an hour to 1700 deg F then a 3 hr hold at 1700 deg F
25 deg F an hour to 1650 deg F then a 1 hr hold at 1650 deg F
K2O 0.17
Al2O3 0.61
SiO2 2.77
molecular percent Silica 62.1%
K2O 0.17
Al2O3 0.60
SiO2 2.91
molecular percent Silica 63.3%
alex-longquan-iron-shino-MLi-MSi is not
quite fired to maturity, as shown by the not completely healed pits,
yet has
low viscosity as indicated by its tendency to run off the pot.
overshadow the brilliant yellow of the
background.
Image of the lower silica glaze alex-longquan-iron-shino-MLi-MSi
inside
outside
Image of the lower alkali metal glaze alex-longquan-iron-shino-MLI-MAlk
inside
outside
oxidation firing to cone 10 in an electric kiln
Firing profile
Up Fire profile cone 10
Down Fire Profile cone 10
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
glaze compositions
Lower Silica Glaze:
Empirical Formula alex-longquan-iron-shino-MLi-MSi:
Na2O 0.26
CaO 0.45
MgO 0.12
Fe2O3 0.08
Lower alkali metal Glaze:
Empirical Formula alex-longquan-iron-shino-MLi-MAlk
Na2O 0.21
CaO 0.46
MgO 0.16
Fe2O3 0.08