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The expiration date on our foods package is always very small. It's very easy to forget.Also it's difficult for seniors to read,If they misunderstand about the expiration date they may eat the food has expired.For kids who doesn't understand the meaning of expiration date.They also has a chance to drink it.
In order to deal with this problem,warning package use special paper print technology.When the expiration date is coming the color of the package will change to remain you to drink it quickly.And if the food has expired, the color will be red.It's also very easy for kids and seniors to read.And avoid them to eat the food has expired.
National Yunlin University
of Science and Technology
Douliu City, Taiwan
Kaohsiung City, Taiwan