Does underglaze turn into glass?

Underglaze is a type of ceramic decoration that consists of colored pigments suspended in a water-based solution. Unlike glaze, underglaze does not form a glassy surface when fired.

Firing Process

During the firing process, underglaze particles fuse with the clay body and become integrated into the ceramic surface. However, underglaze does not form the same glassy, smooth, and transparent surface that glaze does.

Surface Finish

The fired surface of underglaze retains a more matte or satin finish, depending on the specific underglaze used and the firing temperature. Underglaze can exhibit a range of surface textures, from smooth to slightly textured.

Visual Effects

While underglaze does not turn into glass, it can create a wide variety of visual effects on ceramics, including opaque colors, fine lines, intricate designs, and painterly effects.


Underglaze is a versatile decorative material that offers distinct visual characteristics and effects on ceramics, and its unique qualities contribute to the diversity of artistic possibilities in ceramics.

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