Mood ring
Ring that contains a thermochromic element
Mood ring
A mood ring is a finger ring that contains a thermochromic element that changes colors based on the temperature of the finger of the wearer. A mood stone is a thermochromic element in an accessory. Finger temperature, as long as the ambient temperature is relatively constant, is significantly determined by peripheral blood flow. The thermochromic element is in the form of thermotropic liquid crystals that change color in response to changes in temperature.
Read on Wikipedia · Image Moodman001, CC BY-SA 4.0
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