Then the draft was transferred by pencil on white-primed panels of hardwood end grain. Not only was it hard work, but the quality of the printing block was crucial. Everything left white on the block, around Busch's drawn lines, was cut from the plate by skilled engravers. Wood engraving allows a finer differentiation than woodcut and the potential tonal values are of almost the quality of intaglio printing, such as copper engraving. Sometimes the result was not satisfactory, leading Busch to rework or reproduce plates. The wood engraving technique did not allow for fine lines, which is why Busch's drawing, especially in his illustrated tales up to the mid-1870s, are boldly drawn, giving his work its particular characteristic.