Gosai / Gosaide
The five overglaze enamel colors of Kutani ware: red, yellow, green, purple, and navy (gosu) blue. Used in bold, densely painted compositions, gosai creates the sumptuous palette that made early Kutani porcelain famous in Japan and among European collectors.
FAQ regarding "Gosai" (Five-Color Overglaze)
Q1. What is "Gosai" in Japanese ceramics, and what are its key characteristics?
Gosai (literally "Five Colors") is a traditional overglaze enameling technique that utilizes five primary translucent colors: red, green, yellow, purple, and dark blue (navy) on fired porcelain surfaces.
Originating from Chinese Ming Dynasty porcelain, this technique heavily influenced Japanese styles like Kutani ware (Kutani Gosai) and Imari ware. It is distinguished by its vivid, glass-like luster, rich color palette, and slightly raised, tactile texture created by layering thick vitreous enamels.
Q2. How does Gosai differ from "Sometsuke" (underglaze blue) or "Aka-e" (red overglaze)?
The primary differences lie in the color palette and the firing stage (underglaze vs. overglaze).
While Sometsuke uses blue cobalt oxide applied under the glaze before high-temperature firing, Gosai involves applying multiple colored enamels over the already-glazed porcelain and firing it a second time at a lower temperature. Furthermore, compared to Aka-e—which primarily focuses on red and gold accents—Gosai uses a full spectrum of five dynamic colors to create lush, painterly compositions.