How Do Mood Rings Work?

Mood rings were an extremely popular fad in the 1970s. How do mood rings work, and what are the mood ring color meanings?
Mood rings were an extremely popular fad in the 1970s. How do they change color, and can they really tell your mood?

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How Do Mood Rings work?

How Do Mood Rings Work? 💍

How Do NOGU's New MOOD RINGS Work? –