Relief prints are characterized by bold contrasts of dark and light. In this technique the artist first sketches a composition on a hard, flat surface such as a wood or linoleum block; then the parts of the image that are not to receive ink are carved away from the surface, leaving only the composition visible on the top surface of the matrix. Ink is then applied to this raised surface with a roller. The raised image on the block is transferred to paper with a mechanical press or by pressing the block into the paper by hand. Since the areas of the block that were cut-away did not receive ink, they appear white in the printed image. The inked areas are slightly impressed into the surface of the paper from the force of the press and so appear indented into the paper. The primary relief techniques are woodcut, wood engraving and linocut.