Chrome Blue
This glaze is a stiff, micro-crystalline glaze containing barium oxide and
tin oxide. It's blue color derives from the addition of chrome oxide.
It is derived from a beautiful chrome red glaze of David Tsabar, but a
substantial increase in alumina resulted in
inside of bowl:
Outside of bowl:
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
This glaze has .2% Chrome Oxide added
K2O .06
Al2O3 .4
SiO2 2.3
molecular percent Silica 60%
If applied thickly, as on the inside of the bowl, the result is smooth and
stony.
If applied thinly, as on the outside of the bowl, small white grains which
appear unmelted are visible.
This is a stony matte glaze, but it is not crazed. It feels smooth to the
fingers, both on the inside and top edge.
It is interesting that where thinly applied the color shifts somewhat toward
purple, and faint red markings are visible
an extreme change in composition
and has produced a glaze of a different glaze family.
tsabar-chrome-Z2D
bowl is ~3 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 glaze tsabar-chrome-Z2D :
Na2O .20
CaO .47
MgO .01
BaO .26
SnO2 0.15
Remarks
These small grains are an artifact of
insufficent mixing of the glaze slops prior to application.
the larger
lumps seen on the outside of the bowl are uneven throwing ridges.
where it breaks over the throwing
ridges. Chrome with Tin can produce a range of colors other than the
classic pinks and reds.