Anti-stokes Ink
An ink which contains crystals of rare-earth metals (ytterbium, thulium, etc.) and luminesces when exposed to high-intensity IR light 970-990 nm.
a b
a — сover. Gold stamping. White light;
b — the same. Anti-Stokes, green luminescence: text, emblem, biometric symbol
a b
a — front endpaper. Paper substrate. Green decorative frame, intaglio printing. White light;
b — the same. Anti-Stokes, green and red luminescence of the guilloche frame
a b
a — front endpaper. Paper substrate. White light;
b — the same. Anti-Stokes, green luminescence over the whole document page
a b
a — paper substrate;
b — the same. Anti-Stokes, green luminescence of the number