Adulteration

The tampering of a product to extend its use by dilution or deliberate addition of a harmful substance that renders the product dangerous or less effective.

Additive colour

Colours created by the mixing of visible light emitted from different colour light sources.

Adhesive

A means of sticking two surfaces together. In the anticounterfeiting context label adhesive should allow effective application but prevent unauthorised removal.

Actuator

A part of a device or machine that helps it to achieve physical movement by converting energy – often electrical, air, or hydraulic – into mechanical force.