Chameleon for Optoelectronics

A liquid that changes its color “on demand” and can take on any color of the rainbow one desires?

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<p><a href="http://www.physorg.com/news103540306.html">Chameleon for Optoelectronics</a></p> <p>A liquid that changes its color “on demand” and can take on any color of the rainbow one desires?</p>