1. A method for securing an opaque or translucent, colored or colorless object, the method comprising: bonding a label to the object, wherein the label comprises: a first adhesive layer configured to bond the label to the object; and a substrate comprising a first sheet bearing a watermark or pseudo-watermark, a second sheet, and a second adhesive layer containing a luminescent agent binding the first and second sheets together, the watermark or pseudo-watermark having a transparency sufficient to permit observation of the object through the watermark or pseudo-watermark, wherein the luminescent agent is superposed at least partially on the watermark or pseudo-watermark and located between the watermark or pseudo-watermark and the object.