Occasionally the two techniques of aquatint and mezzotint are combined. Several scholars have suggested that mezzotint and aquatint were also used. Martin published mezzotint engravings in 1826 and 1832. There is a very fine mezzotint engraving of this portrait by Charles Turner. In addition to being a painter, John Martin was a mezzotint engraver. He worked in many manners, etching, dry point, mezzotint, sand-ground mezzotint, and burin engraving. His printmaking favor copper plates worked in acid, mezzotint and dry point . She carried on the mezzotint engraving technique that he taught her. It was engraved in mezzotint by T.L. Atkinson in 1864. Several of his portraits he engraved in line and mezzotint. This was engraved as a mezzotint by John Smith and published in 1699. Other tools such as mezzotint rockers, roulets and burnishers are used for texturing effects. Samuel William Reynolds offered to make a mezzotint print, but never completed it. Callcott's "Raffaelle and the Fornarina" inspired a mezzotint of the same name by John Sartain. Rupert did, however, become a noted artist in mezzotint in his own right.