Upon his return, Tsai went back to work at Wangkuan, where he used what he had studied in Japan both to advance his research into glazes and to help him as technical director of production, resolving problems in the production process from forming to glazing to firing. He also developed Taiwan's first flambe glazed tile.
結束日本行，重回王冠窯業任職後，蔡曉芳憑著在日所學，一方面從事釉藥研究，一方面擔任生產技術指導，解決製坯、施釉到燒成等工序，並成功研發、生產台灣首見的「窯變釉磁磚」。