Spark in the dark food

Now THIS is what I call Weird Food: Why do Wint-O-Green Life Savers spark in the dark?
My friend told me that Wint-O-Green Life Savers throw out sparks when you bite them in the dark. We stood in a closet, she bit down on a Life Saver and it was true! Where do those sparks come from? What makes the wintergreen flavor so special?
HowStuffWorks rules.

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