OPTICS & PHOTONICS
Chemists devise reusable “security paper” on which images can be printed invisibly using ordinary H20, recovered using UV light, and erased with heat from a blow dryer.
OPTICS & PHOTONICS
Chemists devise reusable “security paper” on which images can be printed invisibly using ordinary H20, recovered using UV light, and erased with heat from a blow dryer.
