Hans Burgkmair from Augsburg, Nuremberg's neighbour and rival, was slightly older than Dürer, and had a parallel career in some respects, training with Martin Schongauer before apparently visiting Italy, where he formed his own synthesis of Northern and Italian styles, which he applied in painting and woodcut, mostly for books, but with many significant "single-leaf" (i.e. individual) prints. He is now generally credited with inventing the coloured chiaroscuro (coloured) woodcut. Hans Baldung was Dürer's pupil, and was left in charge of the Nuremberg workshop during Dürer's second Italian trip. He had no difficulty in maintaining a highly personal style in woodcut, and produced some very powerful images. Urs Graf was a Swiss mercenary and printmaker, who invented the white-line woodcut technique, in which his most distinctive prints were made.