Question

Which type of glaze firing eliminated the bisque firing and glaze applications?

• A. Reduction glaze firing
• B. Ash glazing firing
• C. Salt glazing firing
• D. Slip glaze firing

Hint:

Logic Tip: Salt Glazing is a "Single-Fire Vapor Glaze." You don't paint it on, and you don't bisque the pots. The fire itself glazes the raw clay.

Answer 1

The Correct Option is C

Concept:
Most modern pottery requires a two-step process: Bisque firing (to harden the clay), followed by physical Glaze application (dipping/brushing), and then a Glaze firing. Certain traditional processes bypass these steps.

Step 1:
Salt glazing is a unique atmospheric vapor-glazing technique developed in Germany in the 14th century.

Step 2:
In traditional salt glazing, potters place completely raw, unbisqued (greenware) pots directly into the kiln. There is no physical liquid glaze applied to the pots beforehand.

Step 3:
When the kiln reaches peak temperature (around 1200°C+), the potter throws common rock salt (Sodium Chloride, $NaCl$) directly into the firebox. The salt vaporizes. The sodium gas travels through the kiln and reacts violently with the silica naturally present in the raw clay surface, instantly forming a durable sodium-silicate glass (glaze) right on the pot.

Step 4:
Because the glaze is created out of thin air via chemical vapor reaction on raw clay, the entire physical process of bisque firing and liquid glaze application is completely eliminated. \[ \boxed{\text{(3) Salt glazing firing}} \]