What happens if you put underglaze over glaze?

Applying underglaze over glaze is an unconventional technique in ceramics that can yield unique and experimental results. However, it’s important to understand the potential outcomes and considerations when using this approach.

Effects of Layering

When underglaze is applied over glaze, several effects can occur:

  • Surface Interaction: The underglaze may not bond well with the glazed surface, resulting in uneven coverage or potential flaking.
  • Color and Texture: The underglaze color may interact with the glaze color, creating new and unpredictable hues. Texture variations can also emerge.
  • Firing Changes: The underglaze may undergo changes during firing, potentially shifting in color or finish.

Testing and Experimentation

Before applying underglaze over glaze to an important piece, it’s advisable to conduct tests and experiments on similar clay and glaze combinations. Testing helps ceramic artists understand how the two materials interact and the effects of firing.


It’s important to consider the intended purpose of the ceramic piece. Applying underglaze over glaze may be best suited for decorative or artistic pieces rather than functional items.


Applying underglaze over glaze can lead to innovative and visually intriguing results, but it requires careful testing and experimentation. Ceramic artists can explore this technique to add depth and complexity to their creations.

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