▎ 摘　　要

NOVELTY - An ink formulation comprises graphene-based component, color change agent, binder and solvent. USE - Ink formulation used for forming image on article e.g. thermoplastic article (all claimed). ADVANTAGE - The ink formulation has excellent laser image quality. The use of graphene-based component increases the plastic ability to absorb heat. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) substrate, which is coated with ink formulation; (2) method of providing an image on a substrate e.g. article, which involves (a) applying an ink formulation to the substrate to form a coating and (b) exposing portion(s) of the coating to electromagnetic radiation to form an image; and (3) article, which comprises graphene-based component and color change agent are embedded.