Leaf Edge

The glaze longquan-iron-shino-Z3N-0 seen here has a transparent matrix with
surface luster and clusters of surface crystals.

The primary difference is that lis-again has lower MgO and higher Fe2O3 than longquan-iron-shino-Z3N-0.
This glaze however is determinedly opaque, the underlying fluid matrix beneath the surface micro-crystals
is visible only where the leaf wash has altered it.

The primary difference between the glaze lis-again and longquan-iron-shino-Z3N-0 is
lower MgO and higher Fe2O3.

The glaze lis-again features a coppery colored thin metallic film over a mottled dark ground.
The autumnal leaf decorating this plate has a prominent undulating edge sharply demarcated.
A subdued leaf gives prominence to its boundary.

Image of the plate with glaze lis-again and leaf wash leaf_Z3K.

full view

plate is ~ 7 inches in diameter.

oxidation firing to cone 10 in an electric kiln

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 1850 deg F then a 2 hour hold at 1850 deg F

300 deg F an hour to 1750 deg F then a 1 hour hold at 1750 deg F

300 deg F an hour to 1700 deg F then a 3 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 Clay Art Center in Tacoma, WA.

glaze compositions

Empirical Formula lis-again:

K2O        0.15
Na2O       0.49
CaO        0.30
MgO        0.06

Al2O3      0.90
Fe2O3      0.22

SiO2       3.57
P2O5       0.08

molecular percent Silica 61.8%

Empirical Formulae of leaf wash glaze leaf_Z3K:

K2O        0.43
Na2O       0.53
CaO        0.04

Al2O3      0.54

SiO2       3.33
P2O5       0.15

molecular percent Silica 48%

A leaf is softened by soaking in water laced with trisodium phosphate. After the pot is glazed, the leaf is pressed
into the glaze. When the glaze dries, a swatch of plate including the leaf is coated with wax. When the wax
is dry, the leaf is removed and the indentations in the glaze are coated with a very thin layer of an
underfired glaze.

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