The Avery Self-Adhesive Paper Badge Dots Roll includes 1000 time-expiring dots that can be easily stuck on to any existing badge. The badge turns pink with the word "VOID" clearly displayed after 4 to 6 hours and each red dot contains special ink. When covered with the white adhesive dot, the ink is activated and gradually migrates to the surface, visibly displaying "VOID" to indicate expiry. The dots are a fast and reliable solution to reinforce access control in offices, schools, events or public areas.