cobalt and nickel green
We show two pairs of glazes. Each pair has either nickel or cobalt added to a base glaze.
Both Base glazes have moderate MgO, minimal CaO and contain TiO2. Alkali metal content in both base glazes is nearly equal to each other and to alumina.
The alkali metal content in each is high in Li2O, being greater than half Li2O.
In the first glaze the remaining base is ZnO. In the second glaze remaining bases are distributed between ZnO and SrO with somewhat more ZnO than SrO.
Glazes are fired at cone 6 in an electric kiln.
The kiln is cooled slowly, at a rate of 25 deg F an hour in the temperature interval 1750 deg F to 1650 deg F, with a 1 hour hold at 1650 deg F.
First Pair
glaze eqAlk_182_0
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The glaze on the left has nickel, on the right cobalt.
Note the striking resemblance of the quality of the green in both glazes. The cobalt color resembles the nickel color with a bit of blue added.
The pot on the right has a leaf print, produced by an additional colored wash.
The contrast color on the rim is spillover from a distinct outside glaze.
Second Pair
glaze eqAlk_182_1
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The glaze on the left has nickel, on the right cobalt.
Note the texture created by the presence of the SrO in this glaze.
With both nickel and cobalt, this is a textured somewhat varigated glaze. As with the first glaze, the cobalt color has an undertone, the color of the nickel glaze, with blue added.
The pot on the right has a run through leaf print at the upper left, an additional colored wash produced these markings.
The dunting crack visible in the right hand bowl is likely the result of the 3/16th inch thick glaze layer in the inside foot ring.
The contrast color on the rim is spillover from a distinct outside glaze.