Chemical oscillations are exploited
to achieve self-expiring graphical
information on paper-based supports with precise temporal and spatial
control. Writing and self-erasing processes are chemically activated
by exciting nonoscillating Belousov–Zhabotinsky (BZ) solutions
infiltrated in cellulose paper filters. Exhausted supports can be
reactivated many times by adding new BZ medium. Different parameters
can be independently controlled to program mono- or multipaced information
storage