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I got help from KRICT, Korea Research Institute of Chemical Technology
Thank you Dr. Hwang and Dr. Choi for helping my video today
This sticker doesn't in form if the food is rot in chemical way
But it lets you know if the food was exposed in room temperature
You can say that it's not accurate
But considering that this sticker costs only 50 cents, I think it's an innovative invention
Furthermore, it will become a great index if you use it in the process of manufacture or distribution
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By adjusting the sticker's thickness or the temperature before it heals, you can alter the sticker based on the specific food's characteristic
Of course more research is needed but I hope there will be a day where we can eat only good fresh food thanks to these stickers