Abstract: Solvent hectograph compositions which are resistant to rapid thickening and gelling during storage in the presence of ambient humidity comprising a cellulose ether film-forming binder material, at least one oleaginous material which is substantially incompatible with said binder material and a major amount by weight of particulate spirit-soluble solid hectograph imaging material, the volatile solvent for said binder material being a lower aliphatic ester which is a substantial non-solvent for said imaging material and which has a partial miscibility with water, the process of making such compositions and the process of producing pressure-sensitive transfer elements from said compositions.

Abstract: Transfer elements for exuding liquid ink to a copy sheet under the effects of imaging pressure, and the method of making such transfer elements. A resinous solvent composition comprising a blowing agent and a soluble solid is applied to a coating surface, the blowing agent is activated and the soluble solid is dissolved out to form a porous resinous layer which is thereafter impregnated with a pressure-exudable liquid duplicating ink.

Abstract: Process for producing multicolor pressure-sensitive transfer elements comprising the steps of preparing a thin microporous resinous layer, impregnating a preselected partial area thereof with a liquid non-drying ink of one color and impregnating another adjacent preselected partial area thereof with another liquid non-drying ink of a different color, an ink barrier preferably being provided between said areas to prevent integration of said different colored inks.

Abstract: A split correction-imaging ribbon comprising a longitudinal strip of film-base adhesive correction composition and an adjacent longitudinal strip of film-base pressure-transferable imaging composition. The two strips are overlapped and bonded together by means of the adhesive correction composition to provide a unitary element such as a typewriter ribbon which is bifunctional, i.e. capable of producing typed images on a copy sheet and also capable of removing such typed images as may be erroneous.