Effect of Phosphorus on a Saturated Iron glaze
Here we show two saturated iron glazes, or rather one glaze
in two incarnations, with and without P2O5.
The empirical formula's of the two
glazes are identical except for the inclusion of P2O5 in the first glaze.
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.
glaze iron_8_R_MgPSi over reactive slip Mug ~4.3 inch high
glaze iron_8_R_MgPSi without Phosphorus on Mug ~5 inch high