Iron and Phosphorus
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 2290 deg F
40 deg F an hour to 2310 deg F with a hold of 10 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
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
This is an experiment in high phosphorus in a saturated Iron glaze.
glaze composition
Emperical Formula satIron_ZJ_1PPP:
K2O 0.02
Na2O 0.31
Li2O 0.25
CaO 0.4
MgO 0.02
Al2O3 .49
Fe2O3 .21
SiO2 3.16
P2O5 .13
The pots is a conical bowls ~3 inches in diameter.
inside of bowl
outside of bowl