A blank for sealing a tray having one or more compartments includes a face stock with a pressure sensitive adhesive pattern which closely matches the top surface area of the tray, excluding the tray compartment areas. The pattern may be precisely formed with the pressure sensitive adhesive containing a coloring or fluorescing agent. The adhesive forms an identifiable registration mark used for properly aligning the adhesive pattern for die cutting the face stock in a specific location in relationship to the pattern. Various types of sensors may be used to identify the registration mark. Alternatively, the pattern may be precisely formed by printing a blocking or deadening agent in a pattern that contains a sensor mark with a blocking or deadening agent that contains a coloring or fluorescing agent, onto a flood coated pressure sensitive adhesive. This pattern forms an identifiable registration mark that is used to properly align the blank for cutting the face stock in a specific location in relationship to the adhesive pattern.
