In one embodiment, a composite ink absorber includes a porous layer and an absorbent layer integrated together into a single part. The second sub-passage is configured to introduce therein a part of air flowing in the first sub-passage, and an inlet of the second sub-passage is open into the first sub-passage at one side in a first radial direction perpendicular to a flow direction of air flowing in the first sub-passage. The disclosure also relates to an electron microscope and a processing system which are adapted for performing the method. In an alternative embodiment, container closure label includes a hook-and-loop fastener system and a tear strip secured only to a base label.