Phosphorus
I show the effect of dusting some TSP - trisodium phosphate - on the surface
of a glaze.
The transparent pale yellow pools in the bottom of the bowl are the result of
a large pour, ~1/4 teaspoon.
The golden crystals seen in the close up are individual grains of TSP, a
light dusting.
I show a close up image of the artifact created by the TSP, and, for reference
an image of the pot.
150 deg F an hour to 250 deg F
400 deg F an hour to 1800 deg F
300 deg F an hour to 2050 deg F
120 deg F an hour to 2310 deg F with a hold of 20 minutes at 2310 deg F
A one hour hold at 1750 deg F
A three hour hold at 1700 deg F
A two hour hold at 1650 deg F
K2O .06
Al2O3 .68
SiO2 4.18
molecular percent Silica 67%
cone 10 oxidation
Firing profile
Up Fire profile
Down Fire Profile
The cones show this as a hot cone 10 firing.
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
glaze compositions
Empirical Formula glaze satIron_mashiko_neph :
Na2O .36
Li2O .12
CaO .28
MgO .18
Fe2O3 .26
P2O5 .09
close up
pot
bowl ~ 4 inches in diameter