| abstract |
Disclosed is a method for manufacturing a multilayer data medium ( 1 ), in which method: a multilayer data medium, including at least one transparent security layer ( 16 ), and at least one marking layer ( 17 ), sensitive to electromagnetic-marking radiation ( 5 ), are selected; the transparent security layer ( 16 ) includes at least one semi-transparent printed image including at least one thermochromic dye; at least one marking ( 30 ) is made using the electromagnetic-marking radiation, through the printed image; the semi-transparent printed image reveals, in a first state referred to as the inactivated state, at least one semi-transparent visible pattern that makes it possible, after the marking step, to view the marking ( 30 ) through the image, the pattern not being visible in a second state, referred to as the activated state. The invention also relates to a multilayer data medium ( 1 ). |