In 1849 Minton engaged a young French ceramicist Léon Arnoux as art director who remained with the Minton Company until 1892. This and other enterprising appointments enabled the company greatly to widen its product ranges. It was Arnoux who formulated the tin-glaze used for Minton’s rare tin-glazed Majolica together with the in-glaze metallic oxide enamels with which it was painted. He also developed the colored lead glazes and kiln technology for Minton’s highly successful lead-glazed Palissy ware, later also called ‘majolica’. This product transformed Minton’s profitability for the next thirty years.