Migration imaging method involving color change

Claim 1

A migration imaging method comprising the steps of: (a) providing a substrate having a layer of softenable material thereon, said softenable material being in contact with migration material, the migration material comprising an imaging composition which comprises at least two differently colored pigment particles dispersed and bound in a polymeric matrix, said particles comprising cyan, magenta, and yellow pigments, at least one of said particles or said matrix being electrically photoresponsive, said imaging compositions exhibiting the resultant color of the differently colored pigments and being capable of forming images in said resulting color without color or particle separation; (b) subjecting said migration material to a migration force in image configuration; (c) softening said softenable material whereby said migration material migrates in depth through said softenable material in imagewise configuration to said substrate to form an image; (d) removing the softenable material and unmigrated material, and; (e) selectively changing the color of said image by means of disrupting said matrix.