Just because a food item may be frozen when you buy it, that doesn't mean it wasn't thawed and refrozen somewhere along the line. A new self-powered sensor, however, would change color to let you know ...
The Takeout on MSN
Why Frozen Blueberries Have A More Vibrant Color Than Fresh
If you've got a big bag of blueberries in your freezer, you may have wondered why the frozen ones are more blue than the ones in your fridge.
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