This site explains the changes, the excerpt is a small explanation:
The item is heated to temperatures up to 1170oC, during which time the clay undergoes
some chemical changes and the silica and feldspar undergo physical changes. The
reactions of the clay can be summarised as follows:
6Al2Si2O5(OH)4 ? 6Al2Si2O7 ? 3Al4Si3O12 ? 2Al6Si2O13
kaolinite metakaolinite silicon spinel mullite
Silica and water (from the crystal lattice) are also expelled during firing, resulting in a
further 5 - 7% volume reduction. This silica mixes with the silica already present and
melts to form a glass. It is this glass, which also includes metallic ions from the
feldspar, that makes the ceramic item non-porous and water-tight.
* The site: http://www.nzic.org.nz/ChemProcesses/inorganic/9C.pdf
Clay is fired in a kiln.
Of course not!
Firing clay is when a clay is fired in a kiln, this is to make the clay stay strong.
bisque is the name of the hardened clay called after the first firing in the kiln.
You can fire clay anytime after it has been crafted.
Clay is fired in a kiln.
Of course not!
kiln
Firing clay is when a clay is fired in a kiln, this is to make the clay stay strong.
. Both: Bisque fire, glaze, Glost fire
bisque is the name of the hardened clay called after the first firing in the kiln.
It is a natural resource, fired by hand.
As long as the clay has not been fired in the kiln, it can be recycled.
You can fire clay anytime after it has been crafted.
Clay is either put into a mold and then fired, or thrown on a wheel by a potter and then fired, or hand sculpted and then fired.
Clay can exhibit both reversible and irreversible properties depending on its treatment. When clay is wet, it can be molded and shaped, making it reversible; however, once it is fired in a kiln, it undergoes a chemical change that hardens it, making it irreversible. This transformation means that fired clay cannot return to its original plastic state. Thus, the reversibility of clay largely depends on whether it has been fired or not.
Fired clay is not reversible; once it has been heated in a kiln, it undergoes a chemical transformation that permanently hardens it into a ceramic material. This process, known as sintering, removes moisture and alters the structure of the clay, making it rigid and unable to return to its original malleable state. While unfired clay can be reshaped or reused, fired clay cannot be reconstituted into its original form.