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Now days there are plenty of firing choices. High –fire with reduction atmosphere is one of the most fascinating firing techniques 2305F
to 2419F.
There are two atmospheres that may develop in a kiln as it fires – oxidation and reduction. If you shut off most of the air, the incomplete
combustion produces smoke and carbon. This incomplete combustion will create a reducing atmosphere. The oxygen will be drawn from
the clay body or from the oxides in the glaze; they are then said to be reduced. For example, copper oxide fired in a oxidizing atmosphere
will turn green, but in a reduction atmosphere it becomes red. Ash and shino glazes are fired at gas kilns at reduction atmosphere.
“Blue Creek Bottles”; thrown on the
wheel and altered, multi-layered slips; wood-
ash glazing, high fired in a gas kiln, multi-media
with natural stones and sand.
“Crochet Vase”; thrown on
the glazing and enamels, high
fire in a gas kiln.
“Pink Snow Flakes ”; thrown
on the wheel , crystalline glazing,
high fire in a gas kiln.
“Zen Jar ”; thrown on the
wheel , crystalline glazing ,
high fire in a gas kiln.
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“Flower vase”; thrown on the
wheel and altered, multi-
layered and under-glazing, high
fire in reduction in a gas kiln.
“Lava Bubble Vase”; thrown
on the wheel and altered, oxide
washes, shino and ash glazes, high
fire in reduction in gas kiln.
“Black Root Jar”; thrown
on the wheel and altered,
black slip application, high
fire in reduction in a gas kiln.
“Multicolor Rock Bowls”; thrown on
the wheel and altered, multi-layered
glazing, high fire in reduction in a gas kiln.
“Zen Red Iron Jars”; thrown
on the wheel and altered, multi-
layered glazing, high fire in a
reduction in gas kiln.
“Under-The-Sea Bowl”;
thrown on the wheel and altered,
multi-layered glazing, high fire in
reduction in a gas kiln.
“Organic Bottle”; thrown on the
wheel, multi-layered shino glazing,
high fire in reduction in a gas kiln.
“Yellow Pitcher”; thrown on
layered glazing, high fire in
reduction in a gas kiln.
High Fire Stoneware in Reduction
"Agate Stone Vessel"; thrown on
the wheel and altered. Multi-layered
glazes were applied to achieve visual
depth. Fired in a gas kiln. Thin
branches and copper wire and
integrated with clay create organic feel.
thrown on the wheel and altered.
Multi-layered r were applied to achieve
Natural stones: amber, carnelian and "
Amber Stone yellow jade integrated with
clay.
"Lapis Stone Vessel": This jar is
thrown on the wheel and altered.
Multi-layered glazes were applied to
achieve visual depth. Fired in a gas kiln in
reduction. Natural stone lapis lazuli
integrated with clay .
ReductionFire
Oxidation Fire
My Favorite Glaze Recipes for Reduction Firing at cone 10
Name of the Glaze
|
Ingredients
|
Weight( %)
|
Name of the Glaze
|
Ingredients
|
|
COPPER RED Note: Should be sprayed or dipped. The glaze is runny if thick but thick layer produces even brighter red.
|
Custer Spar Whiting #10 Texas Dolomite EPK Silica Gerstley Borate Zinc Oxide TOTAL add: Copper Carbonate Tin Oxide:
|
40.00 10.00 5.00 5.00 25.00 10.00 5.00 100 0.5 1.00
|
ORANGE SHINO Note: Great steady glaze, not runny even when thick. Satin surface. Color varies from tan to bright orange depending on thickness.
|
Nepheline Syenite Soda Ash Kona Feldspar Spodumene Calcined Kaoilin Cedar Heights Redart EPK TOTAL
|
40 4 10 16 10 5 15 100
|
WEISER TURQUOISE
|
Dolomite Custer Feldspar Ball Clay Flint TOTAL add: Chrome Oxide Cobalt Carbonate
|
24 63 9 4 100 1.5 0.5
|
|
|
|
|
This basket is thrown on the wheel
and altered. Shino glaze gives the
subtle emphasis to the hand
carvings. Multiple glaze and oxide
wash applications.