Glaze in Pottery: What It Does and Why It Matters

Glaze is a glass-like coating that melts onto ceramic surfaces during firing. Potters use glaze to add color, texture, and surface effects, but glaze also has a practical role: it can help seal pottery and make some forms easier to clean and use.

A good glaze is not just about looks. It also needs to fit the clay body well, mature at the right temperature, and suit the intended use of the piece.

What glaze does

  • Adds color and visual character.
  • Changes the surface finish, from glossy to matte to textured.
  • Can reduce porosity and help make pottery more functional.
  • Interacts with clay and kiln atmosphere to produce different results.

Why glaze fit matters

Even a beautiful glaze can fail if it does not match the clay body underneath it. Poor glaze fit can lead to problems like crazing, shivering, or surface defects. That is why firing temperature, clay type, and glaze formulation all need to work together.

Beginners often think of glaze as paint, but it behaves more like a controlled glass coating that must mature correctly in the kiln.

Common glaze groups