Firing profiles

Up Fire profile

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

Down Fire Profile

300 deg F an hour to 1750 deg F then a half hour hold at 1750 deg F

300 deg F an hour to 1700 deg F then a Three hour hold at 1700 deg F

25 deg F an hour to 1650 deg F then a one hour hold at 1650 deg F

Clay body is a grolleg porcelain from Tacoma Clay Art Center.

Empirical Formula glaze celedon_PA_pumice :

K2O        0.11
Na2O        0.11
Li2O        0.07
CaO        0.42
MgO        0.21
ZnO        0.08

Al2O3        0.41
Fe2O3        0.015

SiO2        3.29

molecular percent Silica 69.8%

glaze has 0.5% silicon carbide added for local reduction of iron.

Empirical Formula Glaze longquan_n_song_Z2G_0PLi_redart

K2O        0.10
Na2O        0.13
Li2O        0.09
CaO        0.49
MgO        0.10
ZnO        0.09

Al2O3        0.48
Fe2O3        0.15

SiO2        3.76

molecular percent Silica 71.5%

glaze has 0.2% silicon carbide added for local reduction of iron.

Remarks

Note that the two glazes have nearly identical molecular fraction of SiO2. Perhaps that is a more important contribution
to the final result than the slight differences in the empirical formula noted.

The glaze longquan_n_song_Z2G_0PLi_redart is derived from a molecular percent formula given by Nigel Wood in chapter 4
of his book "Chinese Glazes".

The glaze celedon_PA_pumice is derived from the work of David Tsabar.