A linerless label system comprising pressure adhesive coating, release coating and thermal imaging coating is described. The thermal imaging coating contains as one of its components the compounds of the formula (I) ##STR00001## wherein R.sub.1 and R.sub.2 are selected from methyl, ethyl, aryl, aryl substituted with methyl, ethyl, methoxy, ethoxy or halogen, benzyl or benzyl with phenyl substituted with methyl, ethyl, methoxy, ethoxy or halogen, R.sub.3,R.sub.4,R.sub.5 and R.sub.6 are selected from hydrogen, halogen, methyl, ethyl, methoxy, ethoxy, phenyl, R.sub.7 and R.sub.8 are each independently selected from methyl or ethyl, R.sub.9 is selected from hydrogen, methoxy or ethoxy, R.sub.10 is selected from hydrogen, dimethylamino or diethylamino, R.sub.11 is methyl. The imaged linerless label according to the invention has been a bar reflectance of less than 20 at 670 nanometers, a print control contrast signal of at least 80 and a BNL background of at least 75%.