Intaglio techniques include engraving, etching, and drypoint. Copper sulfate is used to etch zinc or copper plates for intaglio printmaking. Traditional printmaking techniques, such as lithography, woodcut, and intaglio, can be used to make monoprints. Mezzotint is a printmaking process of the intaglio family, technically a drypoint method. Mezzotint is often combined with other intaglio techniques, usually etching and engraving. Collotypes are printed using less pressure than is used in printing intaglio or stone lithography. Inconsistencies in linework are more apparent in woodcut than in intaglio. Compared to intaglio techniques like etching and engraving, only low pressure is required to print. She started making books herself by using processes such as intaglio and letterpress. There are several types of web printing production methods, including offset, gravure (intaglio), flexography, etc. Hematite is also used in art such as in the creation of intaglio engraved gems. A modeler would duplicate the image on a flat wax plate carving relief and intaglio. This process is similar to intaglio printing. The other side was convex and featured intaglio or cameo scenes from mythology. Collographs may also be printed as intaglio plates.