The novel time-temperature indicator label comprises an ammonia sensitive indicator layer film pressed onto a second film, comprising an ammonia-generating, adhesive layer. When separated the blue-coloured indicator film reverts back to its original (ammonia free) yellow form at a controllable, temperature dependant rate. The labels are easily made and stored.
A. Mills, D. Hawthorne, A. Graham and K. Lawrie, Chem. Commun., 2016, 52, 13987 DOI: 10.1039/C6CC07906G
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