The inker is one of the two line artists in a traitional comic book, or graphic novel. After the penciler gives a drawing (or copy of the drawing) to the inker, the inker uses black ink, usually India ink, to produce refined black outlines over the rough pencil lines. The ink may be applied with a pen or a brush, and many inkers use both. The inker is usually responsible for every black line on the page, except for letters, which are handled by a letterer. In comic strips, as well as Japanese manga, one artist takes responsibility for penciling, inking and lettering, either doing it all him or herself (as for example Charles M. Schulz) or hiring assistants. For comics printed in color, there is usually a separate colorist.