Indelible marking of labels

摘要

A method of indelibly marking a label (10) which includes a substrate (11) (which is transparent or translucent) and an adhesive layer (12). The method includes applying a marking (14) to the adhesive layer such that the marking is visible through the substrate. The marking can include part thereof in a mirror or reverse image of that which is to be visible through the substrate. The marking can be applied by ink- jet, hot-wax or laser marking (13).