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 The
first step in creating your ceramic bisque is to start with nature's own clay.
Like a great sculptor needs his wood, stone or ice, the ceramic bisque creator
will need clay. Mix your clay with some water and what you are left with is
called slip.
The next vital piece of your ceramic bisque puzzle is a plaster mould. The
purpose of the mould is to leech away all the unnecessary water. Your slip goes
into the mould and, as the water is removed the clay will cling to the walls of
your mould. This water is then drained off and what you are left with is a
shell, which is still very wet, very fragile.
Ceramic bisque cannot, of course, be wet. Your clay is left in the mould and
allowed to dry. As it dries it hardens, once the moisture has been pulled out of
the clay you will be free to release it from the mould.
It is always a wonderful experience when the mould is cracked revealing your
future piece of ceramic bisque. To the untrained eye it may look like a hollow
clay shell but in your visualization you are already seeing your wonderful
completed piece of ceramic bisque.
 Please
keep in mind that by virtue of the fact that your ceramic bisque is coming out
of a mould means that there will be seams. These seam lines will need to be
removed along with any other imperfections your ceramic bisque may have.
To clean the casting use a cleaning tool and remove the mould seams from the
piece. Be careful not to gouge. Then, if the piece is plain, without detail,
wipe down gently with a damp sponge to remove scratches and smooth out. If the
greenware is detailed, try not to remove it while cleaning. Using a sponge on a
detailed area could very well remove the detail, so avoid sponging detail. Use
the cleaning tool (finger nail) to put the detail back if removed
The last station on your ceramic bisque creation train is firing. Your ceramic
bisque piece will remain in the oven for up to 6 hours at temperatures in excess
of 1800º F. This will remove all the remaining moisture and harden your ceramic
bisque.
Most decorative ceramic bisque may be fired to an 04/05 cone setting. This is
for use with a glaze finish that will not be used for food items. In general the
glazes are fired to a cone 06 firing, but you must read the label on the glaze
that you use for the proper firing instructions. There are some specialty glazes
that require a different cone firing.
 All
bisque used for food applications must be glazed with a food safe glaze.
If you are finishing a bisque item that you are not going to glaze, the bisque
can be fired to an 05/06 cone firing. Non fired colours such as acrylic stains,
chalks and non firing translucents are applied to the bisque and a spray sealer
or brush on sealer may be applied to protect the finish.
When removed from the kiln your ceramic bisque is a completed product. All that
remains is to finish it in the paint finish that you have chosen. This in itself
is an exciting finale to your "masterpiece".
The Author Trevor Kassulke's wife Anne Kaye is an experienced potter This
article courtesy of
ceramic-ceramics.com is an information resource covering ceramics and
pottery, clay, stoneware, raku, bisque, pottery supplies
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