Method of adding color coded labels to files

In combination, an add-on tab and a file substrate having a straight edge to which said add-on tab is secured, said add-on tab comprising an elongate extension member in abutment with the straight edge of said file substrate and adhesively secured thereto by a carrier web having a thickness in the range of about 3 to 5 mils and of a length approximately equal to the length of said extension member, a plurality of discrete pre-printed labels on the upper surface of the said web with each label spaced in the length of the carrier web and collectively defining a colour code for identifying a code substantially peculiar to such substrate, a transparent high tensile strength reinforcing plastic film of a thickness in the range of about 0.5 to about 2 mils adhesively secured over said labels and said carrier web and extending the length of said carrier web, said carrier web and film being of a width greater than said extension member and being wrapped about said extension member and secured either side and about one edge of said extension member, said add-on tab being secured to said file substrate either side thereof by said carrier web and reinforcing film which bridge the junction of said extension member and said file substrate either side of said file substrate to provide a unitary add-on tab along an edge of said file substrate, said carrier web and said plastic film distributing localized loads applied to said tab along said tab and to said file substrate adjacent said straight edge.