One of two basic types of color proof used to check the registration of the colors, the existence of any egregious blemishes or other undesirable marks, and to confirm size and position of page elements. Single-sheet color proofs—unlike overlay color proofs—are generated on a single sheet of substrate using special toner, dye, or other type of colorant. Some common types of single-sheet color proof, named for the proprietary materials used to produce them, are Cromalin and Matchprint.