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How do mood rings work?

body temperature capillaries Chemistry crystals explanation Jewelry liquid liquid crystal mood Mood ring Rings thermotropic
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How do mood rings work?

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They are liquid crystals that change color with temperature. A nice explanation can be found at owstuffworks.com .

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How Do Mood Rings Work? The mood ring was invented by Joshua Reynolds. Mood rings enjoyed fad popularity in the 1970s and are still around today. The stone of the ring changes color, supposedly according to the mood or emotional state of the wearer. Answer: The ‘stone’ of a mood ring is really a hollow quartz or glass shell containing thermotropic liquid crystals. Modern mood jewelry is usually made from a flat strip of liquid crystals with a protective coating. The crystals respond to changes in temperature by twisting. The twisting changes their molecular structure, which alters the wavelengths of light that are absorbed or reflected. ‘Wavelengths of light’ is another way of saying ‘color’, so when the temperature of the liquid crystals changes, so does their color. Do Mood Rings Work?

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Take a look at the Mood Ring colors listed below, and what “mood” they represent. The colors are listed according to the change in temperature they represent, with dark blue being the warmest and black the coolest.

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