Particle formation by double encapsulation

In an imaging process comprising providing first and second surfaces, sandwiching between said surfaces an imaging suspension comprising electrically photosensitive particles dispersed in an electrically insulating liquid vehicle, while subjecting said suspension to an electrical field, exposing said imaging suspension to a pattern of electromagnetic radiation to which said particles are sensitive and separating the surfaces whereby the exposed particles are retained on one of said surfaces and the unexposed particles are retained on the other surface, the improvement wherein said particles comprise double encapsulated particles comprising a colorant encapsulated in a first resin and second resin encapsulating said first resin, said second resin having embedded therein electrically photosensitive material, and said first resin capable of substantially preventing dark charge injection of said photosensitive material by said colorant.