LABEL STOCK, THAT IS, PAPER SUITABLE FOR BEING PRINTED UPON TO FORM LABELS FOR ARTICLES OF MERCHANDISE AND FOR PACKAGES OF AND CONTAINERS FOR MERCHANDISE, DISTRIBUTED, DIRECTLY OR MEDIATELY, TO PRINTERS OR THEIR CUSTOMERS FOR CONVERSION INTO LABELS, THE PAPER HAVING A POTENTIALLY ADHESIVE COATING WHICH IS NON-TACKY AT ROOM TEMPERATURE, WHICH COATING ON HEATING BECOMES ADHESIVE AND RETAINS SUCH ASHESIVENESS FOR A SUBSTANTIAL TIME AFTER COOLING TO ROOM TEMPERATURE