The smallest individual packaging of a tobacco product (one pack of cigarettes usually holds 20 individual sticks).
A material that absorbs energy at a longer wavelength outside the visible spectrum and emits in the visible spectrum. The materials that can achieve this effect are rare and therefore used for security marking. Up-conversion is an anti-Stokes type emission.
A photochemical process in which high-intensity ultraviolet light is used to instantly cure or ‘dry’ inks, coatings or adhesives.
A first-level requirement of security paper, which needs to be made from virgin pulp which is free of optical brighteners (ie. which is UV-dull). This is because optical brighteners mask or interfere with UV fluorescent security print and fibres.
The part of the electromagnetic spectrum between 100nm and 400nm, or between visible light and X-rays.