| A
blowout happens when a small
piece of the clay mixture explodes in the kiln, blowing off a small
piece of clay and glaze. |
During
firing, air bubbles form in the glaze, but they usually "heal"
themselves during the rest of the firing. The arrow on the right
shows an example of this. (A healed bubble is not considered an
irregularity.) However, sometimes the
burst air bubble doesn't
heal. The arrow at the left shows this example. |
Due to
the thickness of the glaze, it is not unusual for
bubbles to form on
the interior bottom of our pots. |
Overfiring refers to the situation
when the temperature inside the kiln gets too hot or stays at a high
temperature for too long of a time. This results in a darkening of
the glaze color, formation of larger and more highly visible
crystals, and a thinning of the glaze over some sculpted areas. |
Sometimes the glaze runs more than usual or doesn't adhere as well
to the surface of the bisqued pot, resulting in lighter-colored
areas. The bisqued surface of the piece is visible through the
glaze, but the lighter area is not white, which would indicate a
glaze miss. |