micro-crystals
The glaze tsabar-celadon-iron-8-Z2U is a pale green full gloss glaze with
micro-crystals.
Several closeups of the micro-crystals are shown and, for context, a picture
of the pot.
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 0.17
Al2O3 0.60
SiO2 3.12
molecular percent Silica 64%
The close-up pictures were taken with a digital microscope, the intense glare
is the result of poor lighting, for which I apologize.
This glaze has high alumina together with a relatively low silica:alumina
ratio. With different fluxes, first column components
The alkali metal components of this glaze are high, which with lower alumina
might result in a glossy glaze.
The resulting compromise in this case is a full gloss glaze with scattered to
dense micro-crystals, depending on glaze thickness.
Close up Images of the micro-crystals
Image of the piece
inside
outside
bowl is is 4 inches in diameter
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 tsabar-celadon-iron-8-Z2U :
Na2O 0.17
Li2O 0.10
CaO 0.54
MgO 0.02
Fe2O3 0.12
Remarks
in the empirical
formula would give an alumina matte.