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.



full view

glaze iron_8_R_MgPSi over reactive slip Mug ~4.3 inch high



full view

glaze iron_8_R_MgPSi without Phosphorus on Mug ~5 inch high



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