its pressure sensitive self adhesive coating 23 the selected area or spot 13 of active diacetylenic monomer indicator composition is deposited on substrate 11 preferably as an ink or lacquer in a screen gravure or other printing operation a body of reference color such as a registered ring 15 is printed upon composition 13 to provide a means of ready comparison with polymerization color density level during progression of the target shelf life after application of additional desired indicia not shown uv blocking overlay film 18 is laminated preferably by means of an integral self adhesive layer not shown upon the resulting composite label device in contrast to the foregoing structure of the prior art the tti system label 30 of the present invention is fabricated in a manner to yield the device depicted in fig3 while similar release sheet support web 21 and self adhesive label substrate 11 23 materials may be employed to carry the active indicator spot 13 of diacetylenic monomer composition the present invention departs from past practice by applying a uv blocking component layer 33 preferably as a printed uv absorbent transparent lacquer ink composition directly over active monomer component 13 the area of applied layer 33 may be in precise register with that.