Abstract: Pressure-sensitive transfer elements having a plastic film foundation carrying a frangible, complete-release pressure-transfer layer applied by means of a volatile coating vehicle and comprising a solid solution of a fluorescing dye in the resinous binder material of said layer. Such transfer elements are adapted to transfer solid images to the surface of a copy sheet, which images fluoresce under exposure to ultraviolet light and are automatically detectible when sensed on the imaged surface of the copy sheet but are not detectible when sensed through the obverse side of the copy sheet.

Abstract: Pressure-sensitive transfer elements having a polyolefin film foundation carrying a solvent-applied, pressure-transferable complete-release or "correctable" imaging layer comprising a normally-hard resinous binder material, a non-hydroxylated fatty acid oil plasticizer, such as rapeseed oil, which softens or embrittles the resin, a metal salt of a C.sub.10 to C.sub.30 fatty acid, such as zinc stearate, which gels the fatty acid oil, and a quantity of coloring matter. The oil plasticizer of the transfer layer is rendered non-migratory and does not penetrate the polyolefin film foundation, even over an extended period of time, and the transfer layer has excellent cohesive properties and excellent frangibility whereby it transfers readily and completely to a copy paper from the film foundation and yet, according to one embodiment, can be removed completely and cleanly from the copy paper by means of conventional lift-off ribbons or tapes.

Abstract: Pressure-sensitive transfer elements having a plastic film foundation carrying a frangible, complete-release pressure-transfer layer applied by means of a volatile coating vehicle and comprising a solid solution of a fluorescing dye in the resinous binder material of said layer. Such transfer elements are adapted to transfer solid images to the surface of a copy sheet, which images fluoresce under exposure to ultraviolet light and are automatically detectible when sensed on the imaged surface of the copy sheet but are not detectible when sensed through the obverse side of the copy sheet.