date:May 10, 2012
chemical (non-toxic) begins to melt and migrate across the barcode on the label. If the temperature goes back down below the threshold the chemical solidifies and stops migrating.
Cureton added as the chemicalmigrates, it colours in missing bars to complete a row of the barcode and when the row iscompleted the row above it becomes void by filling in more bars.
The label tracks cumulative temperature abuse timethe product spends above the threshold temperature and is irreversible, and theref