Mood ring
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A mood ring is a novelty ring which changes color in response to body temperature, using a liquid crystal sensitive to temperature. A form of biofeedback, they supposedly indicated the temperament of the wearer, indicated by the ring's color. Mood rings were a fad whose popularity peaked in the United States in the 1970s, and they are now seen as an icon of 1970s culture.
Not everyone agrees on what the colors mean, but generally black stands for stressed or anxious and blue represents happy or relaxed.
See also:
Categories: Fads | Rings