|Monthly Tech-Tip |
This is GA10-B Alberta Slip tenmoku glaze over L3954N black engobe (top half of mug). The body is H550. The glaze only contains 2% added iron oxide and the engobe under it has 10% black stain, only a reduction atmosphere could produce this metallic effect with so little colorant.
A method of firing stoneware where the kiln air intakes and burners are set to restrict or eliminate oxygen in the kiln such that metallic oxides convert to their reduced metallic state.