Activatable time-temperature indicator

Details Activatable time-temperature indicator Activatable time-temperature indicator

G - Physics

01

N

150/26, 116/66

G01N 21/25 (2006.01) G01K 3/04 (2006.01) G01N 21/78 (2006.01)

Patent

CA 1287290

ABSTRACT OF THE DISCLOSURE ACTIVATABLE TIME-TEMPERATURE INDICATOR An activatable time-temperature indicator consists of an oxygen-sensitive reaction product of a triarylmethane dye and a decolorant that is coated on a substrate and covered by an oxygen barrier. Optionally, an oxygen-permeable layer is between the coating and the oxygen barrier. The indicator is activated by removing the oxygen barrier. Following this activation step, a progressive color development occurs at a rate that increases with temperature. The indicator is useful for monitoring the freshness of perishable products, particularly those stored at sub-ambient temperature.

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