Abstract: A migration imaging system including imaging members comprising a substrate overcoated with a softenable layer, and migration marking material, with the softenable layer having a thin surface skin of material having a higher viscosity than the remainder of the softenable material layer.

Abstract: A translucent film having good water permeability and having dissociating power with respect to metallic ions is produced by subjecting one side of a cellulose film to acetylation treatment so as to highly acetylate said one side while leaving the other side unacetylated.

Abstract: Material from a layer of migration material spaced apart from at least one surface of, but contacting a softenable layer is caused to imagewise selectively migrate to at least locations in depth in the softenable layer, by (A) subjecting said migration material to an imagewise migration force and changing the resistance of said softenable layer, to migration of migration material or by (B) subjecting said migration material to a migration force and imagewise changing the resistance of said softenable layer to migration of migration material.

Abstract: A migration imaging system wherein migration imaging members typically comprising a substrate, a layer of softenable material, and migration marking material, additionally comprises an overlayer of electrically conductive material which is electrically connected to electrically charge the imaging member.

Abstract: A migration imaging system wherein migration imaging members typically comprising a substrate, a layer of softenable material, and migration marking material, additionally contain one or more overlayers of material to produce improved results in the imaging system. The overlayer may variously comprise another layer of softenable material, a layer of material which is harder than the softenable material layer, or a gelatin layer.

Abstract: Images are formed with imaging members comprising one or more migration layers and a softenable layer which may be a circulation layer. An electrical latent image is created on the member with electrostatic charge having a density sufficient to cause migration of the marking material from the migration layer through the migration layer -- softenable layer interface and into the softenable layer. When the migration layer and softenable layer comprise materials sufficiently dissimilar so as to retard or prevent penetration, the softenable layer is a circulation layer, the circulation of which enables penetration of the interface by marking material. In a multiple migration layer member, the migrated marking particles have their relative positions inverted.