Cobalt in Saggar Firings
I was very excited by the results of last week's saggar firing. I have tried cobalt in saggars before and never got more than blushes of periwinkle. This week, I was surprised with full-blown deep blues, as well as vibrant pinks.
Here is what I did to get these results:
-First, each pot was painted with a wash of cobalt carbonate mixed with water.
-The pots were wrapped in newspaper bundles filled with hay and a lot of miracle grow (about 1 Tbs. per pot)
-The bundles were placed in clay saggars with rock salt sprinkled liberally around them.
-The kiln was fired to 1600 degrees in about 3 hours.