Term
|
Definition
| A clay material with the chemical composition Al2Si2O5(OH)4, the purist form of clay. |
|
|
Term
| Hawthorne Bond (Fireclay) |
|
Definition
| Refractory clay used because of its large partgicle size (which controls shrinkage) and high firing temperature. |
|
|
Term
| OM-4 (Old Mine #4, Ball Clay) |
|
Definition
| Refractory clay used in clay bodies for its high plasticity and green strength. Because of its high shrinkage rate it is often used with other clays rather than alone. |
|
|
Term
|
Definition
| Used as a glass former in clay bodies, thus promotes vitrification, or the formation of crystal structures among the more refractory materials in the clay body. |
|
|
Term
| Fine Grog (Body Aggregate) |
|
Definition
| A granular additive to clay bodies made of pre-fired ceramic material. It is used to control drying and firing shrinkage. |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Denoting a mixture of solids (in fixed proportions) that melt at a single temperature that is lower that the melting points of the separate constituents. Also, a term used to casually discuss glaze interaction. |
|
|
Term
|
Definition
| A vitreous coating to a ceramic material whose primary purposes are decoration or protection. Glazes can be considered a specialized form of glass. |
|
|
Term
|
Definition
| A firing technique where the fuel and oxygen ratio in the kiln is manipulated in order to produce a less than efficient burn, causing a carbon rich atmosphere in the kiln. This type of "atmospheric" firing gives the ceramist a color palate not available in oxidation firing. |
|
|
Term
|
Definition
| A device used to measure exposure (time plus temperature) during a firing cycle. |
|
|
Term
|
Definition
| The process of carving or scratching through a slip or engobe to expose the contrasting clay body underneath. |
|
|
Term
|
Definition
| A process of inlaying slip or engobe into incised or recessed imagery. |
|
|
Term
|
Definition
| Simply, liquefied clay. Usually liquefiedby adding excess water, but also at times through the addition of deflocculants. |
|
|
Term
|
Definition
| Made for broader uses than a slip (such as use over bisqueware), engobes often contain very little plastic clay, though they appear similar to slips. |
|
|
