Chrome Oxide in a strontium/rutile glaze
cone 10 oxidation
Firing profile
A two hour hold at 1850 deg F
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 half hour hold at 1650 deg F
I have no reason to think this firing profile is necessary to this glaze
There were other glazes in this test firing to which it was relevant.
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
glaze composition
In the empirical Formula:
The glaze has nearly equal alkali metals and alumina at 0.5 and silica 3
The remaining non alkali metal bases are
MgO is .29
SrO is .16
CaO is .05
TiO2 is .17
This glaze, paperWhite_ZI_0 contains substantial TiO2, and Strontium. With
both Cobalt, and Chrome, the glaze is the expected cobalt green.
With
only the Chrome, the result is almost a chrome yellow.
The pots are small distorted cones ~4 inches in diameter.
Glaze containing 1 % Cobalt carbonate and 0.1 % Chrome oxide
same glaze Glaze containing 0.1 % Chrome oxide