Polymer opal films shed new kind of light on nature

Imagine cleaning out your refrigerator and being able to tell at a glance whether perishable food items have spoiled, because the packaging has changed its color, or being able to tell if your dollar bill is counterfeit simply by stretching it to see if it changes hue.

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<p><a href="http://www.physorg.com/news104427587.html">Polymer opal films shed new kind of light on nature</a></p> <p>Imagine cleaning out your refrigerator and being able to tell at a glance whether perishable food items have spoiled, because the packaging has changed its color, or being able to tell if your dollar bill is counterfeit simply by stretching it to see if it changes hue. </p>