Sealing labels for tamper-evident closure of conventional containers. Highly visible, red background with large white marking area and sequential, 7-digit, numerical identification. A secondary, identically numbered, label strip can be used for archive documentation of the sample. Labels are aluminium foil-backed for enhanced conformity to most container/sack profiles and a very strong adhesive surface ensures that once applied, the label is permanently affixed. Cross-perforations through the label immediately tear should an attempt be made to remove the cap or seal. Overall label size 178 x 30mm L x W.