DEVICE FOR OBCURING PRINTED INDICIA AND METHOD OF USE

摘要

A device for obscuring printed indicia includes a printable substrate, an indicia printed on a first surface of the substrate, an irreversible thermochromic material operably associated with the printable substrate which does not affect readability of the indicia when not subjected to a predetermined critical temperature and when subjected to the predetermined critical temperature renders the indicia unreadable by virtue of a color change surrounding the indicia. The indicia can be a barcode. Methods of obscuring and use include the device.