CryoSTUCK cover-up labels are designed to be applied on both frozen and ambient temperature existing labels/surfaces in order to conceal their information. These cryogenic labels are ideal for re-labeling frozen cryo vials and microtubes as well as freezer boxes without the need for thawing, cure time, or any other special treatment*. They maintain excellent long-term adhesion for prolonged storage in liquid nitrogen tanks (-196°C/-321°F), ultra-low temperature freezers (-80°C/-112°F), and dry ice transportation. These blackout CryoSTUCK labels will completely obscure the existing information or even part of the information, such as barcodes or text.Our permanent cryo blackout labels will also resist elevated temperatures up to +121°C/+249°F and are perfectly suitable for identifying containers destined for standard steam autoclave cycles (+121°C/+250°F, 16.5 psi, 20 minutes) as well as oven dry heat. CryoSTUCK block-out labels are printable with most common thermal-transfer printer