The Baxter colour printing process was developed by George Baxter (1804-1867). Having been apprenticed to a wood-engraver, he spent 8 years developing his technique which became internationally renowned. His first colour print, Butterflies, was produced in 1829.The process combined an engraved metal plate with up to twenty engraved wooden blocks, each printed in a separate colour in a combined intaglio and relief process . The prints were both good quality and cheap and large numbers were produced. Baxter's prints were used for a variety of purposes including notepaper, pocket-books, decorated music sheets, and needle cases, and book illustrations. Baxter's innovatory process was given a royal patent in 1835 (Patent No. 6916 – Improvements in Producing Coloured Steel Plate, Copper Plate and other Impressions). The patent lasted from 1835 to 1854. During the last few years of this period Baxter licensed his method to various printers, who used it until the 1870s.