A Nickel Blue Glaze
This glaze is derived from the glaze number 404 in "The Potter's Book of Glaze
Recipes" by Emmanuel Cooper.
It has traveled a considerable distance, the zinc is gone, the alumina and
silica considerably higher.
150 deg F an hour to 250 deg F
400 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
50 deg F an hour to 1700 deg F
25 deg F an hour to 1650 deg F then a one hour hold at 1650 deg F
K2O 0.10
Al2O3 0.35
SiO2 2.4
molecular percent Silica 63.92%
added 1.5% Black Nickel Oxide
The legacy remains, minimal calcium and
magnesium, and 1.5% Black nickel oxide.
Image of the glaze cooper_404_2MZn
inside
outside
bowl is ~ 3.5 inches in diameter
oxidation firing to cone 10 in an electric kiln
Firing profiles
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Clay body is a grolleg porcelain from Tacoma Clay Art Center.
glaze composition
Empirical Formula cooper_404_2MZn :
Na2O 0.10
Li2O 0.26
CaO 0.01
MgO 0.01
BaO 0.52