Track-And-Trace

Overt and covert security devices

Overt entry-level security devices often used on packages are familiar to consumers, and they are a first-line choice as a means of reassurance of brand authenticity and purity. Examples are over-the-cap pressure-sensitive paper 'seals' on jars and bottles, made from papers that tear easily, which provide ready evidence of tampering; and optically-variable devices (OVDs) in the form of holograms, either unique (a specialist converting technique) or generic (created by a patterned substrate).