Question

Lusture is a form of which type of decoration process?

• A. under glaze decoration
• B. over glaze decoration
• C. inlay glaze decoration
• D. mix glaze decoration

Hint:

Logic Tip: Luster is metallic. Metals melt or burn off at high temperatures, so they must be applied over the glaze and fired at a very low temperature at the very end.

Answer 1

The Correct Option is B

Concept:
Luster (or lustre) decoration is a traditional ceramic technique that creates a thin, metallic, iridescent film on the surface of a ceramic piece.

Step 1:
Luster involves applying metallic salts (such as copper, silver, or gold) suspended in an organic binder (like resin).

Step 2:
This metallic mixture cannot be applied directly to raw clay or put under a glaze, because high kiln temperatures would burn away or vaporize the thin metallic layer. Instead, it must be painted onto a piece that has already been glazed and fired.

Step 3:
Once applied to the glossy surface of the fired glaze, the piece is fired a third time at a very low temperature (often in a reduction atmosphere). The binder burns away, and the metal fuses onto the very top surface of the glaze.

Step 4:
Because the decoration is applied entirely on top of a pre-existing, fired glaze, it is categorically defined as an overglaze technique. \[ \boxed{\text{(2) over glaze decoration}} \]