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A mood ring is a finger ring that contains a thermochromic element, or "mood stone", that changes colors based on the temperature of the finger of the wearer. Finger temperature, as long as the ambient temperature is relatively constant, is significantly determined by peripheral blood flow.
A mood ring is an example of this property used in a consumer product although thermochromism also has more practical uses, such as baby bottles, which change to a different color when cool enough to drink, or kettles which change color when water is at or near boiling point.
Thermochromic ink (also called thermochromatic ink) is a type of dye that changes color in response to a change in temperature. [1] [2] [3] It was first used in the 1970s in novelty toys like mood rings, but has found some practical uses in things such as thermometers, product packaging, and pens. [4]
A mood ring is a type of ring created in 1975 that changes colors based upon the temperature of the finger of the wearer. Mood Ring may also refer to:
On Tuesday, the singer-songwriter-pop supernova released “Mood Ring,” and in her email newsletter, Lorde said that the song is about “wellness culture and the search for spiritual meaning in ...
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The mood stone ring was made of sterling silver or vermeil (gold-gilded sterling), whereas the majority of mood rings used base metals, such as copper. Changes in peripheral blood flow (thus finger temperature) caused the liquid crystal to reflect different wavelengths of light, which change the color of the stone.
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