Patent ID: 11945972
Assignee: VIAVI SOLUTIONS INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B  G | IPC B  C

Claim 19:
20. A method of authenticating a security device, comprising:
viewing, at a normal angle, an article imprinted with a composition,
wherein the composition includes a first color shifting pigment having a first color shift that extends from a starting color at normal through a plurality of colors as a viewing angle is increased to a final color at perpendicular to normal, wherein the first color shift rotates counterclockwise relative to, and about, an origin of the L*a*b* color space; and a color filter that transmits a portion of the first color shift of the first color shifting pigment and absorbs a remainder of the first color shift of the first color shifting pigment; and
viewing, at a viewing angle, the imprinted article;
wherein the composition has a second color shift different from the first color shift; and
wherein the second color shift has a first portion that rotates counterclockwise relative to the origin and a second portion that rotates clockwise relative to the origin.