Mood rings. Do they work?

My mom got this mood ring
Usually I get
Blue:relaxed, at ease, calm, loveable, content

But today I got

Dark blue: very happy, in love, passionate, romantic

How do these things work

My dad got purple which isn’t on the chart

They’re just temperature sensitive.
Blue = warm
Black= cold
Green = medium
Think purple = very warm.

They were real popular back in the late seventies, everyone in school had to have one.

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Oh the seventies …where everything was so groooovy

The technology was originally meant to be a biofeedback device to help people monitor their moods, but it was found to be ineffective. Now, they’re just a novelty.

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