A color changing device for monitoring the time-temperature storage history, i.e. shelf life, of perishable products. The device is constructed of an activator tape, containing an activator composition matrix, an indicating tape, containing an indicating composition matrix and an optional barrier matrix...http://www.google.es/patents/US5053339?utm_source=gb-gplus-sharePatente US5053339 - Color changing device for monitoring shelf-life of perishable products
Color changing device for monitoring shelf-life of perishable products
