Patent US 5,840,657

A linerless continuous series of pressure sensitive adhesive labels is provided which have on one or more selected portions thereof a series of imagable coatings which may be activated to form colored images or areas. The series of labels include a web having first and second surfaces, with a series of imagable coatings of color formers and color developers on the first surface of the web. A coating of a release material overlies the imagable coatings on the first surface of the substrate, and a coating of a pressure sensitive adhesive is positioned on the second surface of the web. The series of labels are wound or stacked so that the coating of pressure sensitive adhesive contacts the release material to permit individual labels to be dispensed.