Ceramics Vocabulary
B
Banding Wheel
A hand-operated turntable used to rotate your work during the decoration process. [video]
Bat
A slab or platform on which clay is handled; a circular device attached to the wheel-head.
Bisque
Unglazed clay, fired once at a low temperature.
Bisque firing
The process of firing unglazed clay to a low temperature to harden the clay and drive the physical water from it. The approximate temperature of this firing is 1815 F.
Bone dry
Refers to clay which is ready to be fired. All the moisture is gone from the clay. Clay is VERY FRAGILE at this stage.
C
Centering
The act of aligning the clay on the potter's wheel in order to proceed with forming and shaping.
Ceramics
The art of making things of clay. Clay is an ancient tradition.
Clay
A decomposed granite-type rock. To be classified as clay the decomposed rock must have fine particles so that it will be plastic .
Coils
Rope like pieces of clay.
Coil construction
Rope like pieces of clay that are stacked to form a wall and build the object. This technique is one of the most commonly used hand-building methods.
F
FIRE
To bake in a kiln. Firing is a term used for “cooking” the clay.
FORM
Three-dimensional shape and structure of an object.
G
GLAZE
A glassy coating that has been melted onto a ceramic surface. It is used to decorate the piece and to seal the clay surfaces.
GLAZE FIRE
Much hotter than a bisque fire. Firing to a temperature at which glaze melts to form a glasslike surface.
GLAZE FIRING
Typically the second firing of a piece of pottery which has been coated with glass-forming materials. The approximate temperature of this firing 2300.
GLOSS
A shiny surface.
GREENWARE
Unfired pottery that is bone-dry, a state in which clay forms are the most fragile.
H
HANDBUILDING
One of the oldest craft techniques in which objects are constructed entirely by hand.
I
INCISING
Indenting a line into a flat surface.
K
KILN
Enclosed containers of various sizes- built of refractor brick and heated by electricity, gas, oil, or wood to temperatures from 1500 F. to 2340 F. in which ceramic ware is fired. Also called the “oven” for firing the clay.
L
LEATHER HARD
Refers to clay that is dry enough but still damp enough to be joined to other pieces or carved without distortion. Clay at this state resembles leather. Hard to bend and soft enough to be carved.
M
MATTE
Not shiny.
P
PLASTICITY
Quality of clay that allows it to be manipulated and still maintain its shape without cracking or sagging.
POTS
Have a function (use) like a pot or a bowl.
POTTERY
Pottery was one of the first art forms explored by mankind. There are many extinct cultures throughout the world who did not leave behind any written record of their existence. For some of these civilizations, the only evidence of their daily lives comes in the form of pottery. Some pots were for daily use and some were for ceremonial purposes. Some cultures buried their pots with their dead, and some had huge garbage dumps where broken pots ended up. Pottery and other forms of ceramics have left behind an important archeological record
PRESS MOLD
A form which clay is compressed into, resulting in a repeatable shape or texture. These are usually made of plaster. We used plastic bowls lined with cheesecloth as press molds.
R
RAW-WARE
Unfired clay
S
SCORING
Roughing up of the surface of clay for joining.
SLAB
Clay which has been made flat by rolling.
SLAB CONSTRUCTION
Handbuilding technique in which flat pieces of clay are joined (clay is flattened and thinned with a rolling pin or slab roller)
SLIP
A liquid form of clay used as a glue or as decoration.
SLUMP MOLD
A form which is used to support wet clay in the early stages of construction. They are typically made of plaster. We used plastic bowls covered with plastic or newspaper.
STONEWARE
A type of clay that is usually brownish or gray in color. It is good for hand building and throwing because of its high plasticity. Our clay fires to cone 6.
T
THROWING
Forming clay on a potter's wheel.
U
UNDERGLAZE
Colored decoration applied to bisqued clay, then coated with a clear glaze. Typically made of clay slip and raw pigment.
W
WEDGING
Method of kneading clay to make it homogenous; ridding the clay of all air pockets.