Faceted Glaze
A Glaze containing Zinc, Strontium and cobalt.
This glaze has a steel blue matrix, with regions covered in lavender and purple
facets. The glaze surface is
A closeup of the surface displaying the needle crystals is shown, and a
picture of the bowl.
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 two hour hold at 1850 deg F
300 deg F an hour to 1750 deg F then a one 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 0.10
Al2O3 0.50
SiO2 2.75
molecular percent Silica 64.7%
Added:
2.5% Cobalt Carbonate
covered in needle crystals woven into a larger
hexagonal lattice structure. The boundaries between the purple,
lavender, and
blue regions are sharply demarcated. Perhaps that sharp definition of the
various regions is an
indication of phase separation within this glaze.
Image of the glaze zincSr_Z3R
inside
outside
closeup of the glaze zincSr_Z3R
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 composition
Empirical Formula zincSr_Z3R :
Na2O 0.38
CaO 0.02
MgO 0.16
SrO 0.15
ZnO 0.19