A Monotype is made by painting with oil paint diluted with turpentine. The turpentine is used to delay drying of the oil paint. The painting is done on a non-absorbent surface like glass, marble or aluminium.
When the painting is finished, a sheet of very absorbent paper is laid on the painted surface and then carefully lifted from the painted surface.
Each process is a one time operation and only one picture may be made each time.