The disposable device is intended to be adhered to the packaging of temperature-sensitive foods such as meat, fish, fruits and vegetables. It could also be applied to other products that need to be kept frozen or refrigerated, like medications.

The thin, flexible sticker incorporates a surface film made of polymer nanofibers, which neatly intersect one another as long as the ambient temperature is cold. This causes the film to appear opaque, keeping an underlying image on the sticker from being seen.

[Source: New Atlas. 7 April 2020. Ben Coxworth]