Shita-etsuke (underglaze decoration)
Decoration applied directly to the bisque-fired clay body before glazing. In Japanese ceramics, shita-etsuke using cobalt (gosu) creates the classic sometsuke (blue-and-white) style of Arita and Hasami porcelain.
FAQ regarding Underglaze Painting (Shita-etsuke)
Q1. What exactly is the "Underglaze" (Shita-etsuke) technique, and how does it differ from "Overglaze" (Uwa-etsuke) painting?
The primary difference lies in the timing of the painting and whether the decoration sits above or below the glassy glaze layer.
Underglaze (Shita-etsuke): Pigments (such as cobalt blue) are applied directly onto the porous, bisque-fired clay. A clear glaze is then applied over the painting, and the piece is fired at a high temperature (approx. 1,200–1,300°C). Since the design is sealed under the glass layer, the image will never wear off, fade from friction, or be damaged by detergents and dishwashers.
Overglaze (Uwa-etsuke): Pigments are painted on top of a finished, glossy glaze layer after the main high-temperature firing, and then fixed in a separate, lower-temperature kiln (approx. 700–800°C).
Q2. What are the unique charms and characteristics of underglaze-decorated pottery?
The primary charm is its "gentle, deep hues and completely smooth texture that naturally complement any dish or tea."
Because the artwork is viewed through a protective layer of glass, it acquires a soft, moist, and watercolor-like depth. A classic example is the Sometsuke (blue-and-white porcelain) of Arita and Hasami ware, which uses cobalt blue on white clay. While the range of colors is more limited than overglaze painting because the pigments must withstand extreme kiln heat (mostly blues, browns, and blacks), this constraint yields a timeless, understated elegance that blends seamlessly into everyday dining.