Index marking article for superposed sheets

An article for applying index marks in precise superposed relation on a juxtaposed pair of receiver sheets comprising a carrier sheet having a first and a second surface, adhesive means on said first surface for fixedly mounting said carrier sheet to a receiver sheet, said second surface of said carrier sheet including a first index mark fixedly bonded thereto, a release coat superposed over said first index mark, a second index mark releasibly supported on said release coat in precise registry with said first index mark, said second index mark comprising an opaque dry transfer mass including pressure activated adhesive components integrated therein and exposed at the surface of said second index mark remote from said release coat.