Abstract: A method for manufacturing flexible printed circuits for smart card modules, wherein a complex material is provided. This complex material includes an assembly including at least two different-colored strata. Zones of this assembly are visible through the layer of electrically conductive material. This manufacturing method includes an operation that consists in laser etching at least one of the two different-colored strata over a portion of that zone of the assembly of strata that is left visible, so as to reveal the color of the other of the two different-colored strata. Printed circuit manufactured by this method. Module and smart card including this printed circuit.

Abstract: Method for the electrochemical metallization of a double-sided electrical circuit for a chip card. Contacts and current leads are located on a front face. An antenna and connection pads are located on a rear face. This method includes an operation of electrochemically depositing at least one layer of electrically conductive material on connection pads, while supplying these connection pads with current via the current leads, contacts and metallized holes establishing electrical continuity between the front face and the rear face. This method furthermore includes, after the operation of electrochemically depositing at least one layer of electrically conductive material, an operation of electrically isolating at least one metallized hole from a connection pad. Electrical circuit obtained using this method.

Abstract: The invention relates to an electrical circuit, for example of the printed circuit type, for producing a module intended to be integrated into a chip card. This module has electrical contact—or connector—areas for the connection and communication of the chip to and with a read/write system. In order to give them a different colour from the gilded or silvered ones generally used, these electrical contact areas are at least partially covered with a surface layer comprising a compound of XpOqNrCs type, in which X may be Hf, Ta, Zr, Nb, Mo, Cr, V, Ti or Sc, with p, q>0 and r?0 and/or s?0. The invention also relates to a method for manufacturing such an electrical circuit.

Abstract: Method for the electrochemical metallization of a double-sided electrical circuit for a chip card. Contacts and current leads are located on a front face. An antenna and connection pads are located on a rear face. This method includes an operation of electrochemically depositing at least one layer of electrically conductive material on connection pads, while supplying these connection pads with current via the current leads, contacts and metallized holes establishing electrical continuity between the front face and the rear face. This method furthermore includes, after the operation of electrochemically depositing at least one layer of electrically conductive material, an operation of electrically isolating at least one metallized hole from a connection pad. Electrical circuit obtained using this method.