Iron Yellow
This glaze has a micro-crystalline surface, yet has a silky smooth feel. It
is a pale iron yellow.
This glaze is derived by a circuitous route from the molecular percent for a
Longuan northern celedon glaze given by Nigel Wood
inside of bowl:
Outside of bowl:
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
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
This glaze has 0.2% silicon carbide added.
K2O 0.14
Al2O3 0.54
SiO2 2.79
molecular percent Silica 64.3%
A line was crossed.
The celadons given by Nigel Wood were underfired in an oxidation firing at
cone 10.
Replacing alkali metals with alkaline earths decreased
crazing in these glaze. I wondered how far that could go,
This glaze has slightly higher alkali metals than the Longquan north song
celadon given by Nigel Wood,
As local reduction is irrelevant to an iron yellow, it will be interesting to
see the color of this glaze without the SiC.
in chapter 4 of his book
Chinese Glazes. Because it is fired in oxidation, it has silicon carbide
added to promote locale reduction.
longquan_n_song_Z2H_0
bowl is ~3 inches in diameter
oxidation firing to cone 10 in an electric kiln
Firing profiles
Up Fire profile
Down Fire Profile
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
glaze compositions
Empirical Formula glaze longquan_song_Z2H_0 :
Na2O 0.07
CaO 0.60
MgO 0.11
ZnO 0.08
Fe2O3 0.01
Remarks
Reducing the silica will give a
seemingly mature glaze, which however will likely craze.
and what the
transition would look like.
with substantially lower silica.