Color in glazes containing Chrome Oxide
cone 10 oxidation
Firing 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.
glaze composition
In the empirical Formula:
The two glazes paperWhite_ZI_6, and chrome_2017-08-1
have in common
alkali
metals .52
MgO .3
alumina 0.5
silica 3
tiO2 .18
The remaining alkaline earths are
.16 SrO in paperWhite_ZI_6
.16 BaO
in chrome_2017-08-1
The first glaze contains in addition 1 % Cobalt Carbonate and .2 % Chrome
Oxide.
The second glaze contains .2 % Chrome oxide.
The pots are 6 inch diameter cylindrically shaped bowls first faceted then
stretched.
this is a poor first attempt to make the "hank Murrow" bowl,
which is why these are test pots.
paperWhite_ZI_6 with 1% cobalt carbonate 0.2 % Chrome oxide
close up of a yellow dominant section of the glaze
Note that although the predominant color of the pot is green, it is
varigated, showing a variety of colors.
The close up shows a section of
the pot where the yellow phase dominates.
glaze chrome_2017-08-1 + .2 % chrome oxide
This glaze is a close relative of the glaze chrome_2017-08-0 seen
yet now it is a pale creme color devoid of yellow.