Security ink composition and machine-readable security feature derived therefrom

Abstract

A security ink composition comprising at least one non-luminescent undoped Y3Fe5−xMxO12-based pigment, wherein x fulfils the condition 0≤x≤1.25; M is selected from a group consisting of aluminum, gallium or calcium and mixtures thereof, and wherein an applied, preferably printed, at least one machine-readable security feature derived from said security ink composition, after drying and/or curing, has an integrated magnetic susceptibility of at least about 200×10−12m3 and presents a ferromagnetic resonance (FMR) signature for authentication purposes. A method for authentication of a machine-readable security feature derived from the security ink composition.

Dependencies are inferred from the claim text.