Patent ID: 7546923

Claim:
A kit comprising: i) a packaging device comprising, a cosmetic product; at least one container forming at least one compartment in which said cosmetic product is directly or indirectly placed, said container being configured to fit inside said packaging device; at least one authentication element on an outer surface of said packaging device or of said container, said authentication element incorporating at least one first chemical reagent having a composition such that, when placed in contact with a second chemical reagent present on a counterpart authentication element, said first chemical reagent produces a detectable change in the second chemical reagent on the counterpart authentication element; and ii) a strip supporting said counterpart authentication element incorporating said second chemical reagent which has a composition such that, when placed in contact with said first chemical reagent on said authentication element of the device, said second chemical reagent is modified in a detectable manner, and wherein the composition of the second chemical reagent is such that the second chemical reagent is chromogenic following contact with the first chemical reagent.