A composite material (1) comprising at least one prepreg (3), said prepreg comprising at least one polymeric resin and optionally at least one fibrous reinforcement; and a conducting ink (2) applied to at least one surface of said prepreg (3); where the conducting ink (2) has a surface tension lower than the surface energy of the at least one surface of said prepreg (3) to which the ink (2) is applied.