Scientists at the University of California have come up with a nifty new way to utilize nanoparticles of gold. A solution of gold particles embedded in a polymer film creates a bright blue color, which turns red after pressure is applied on the film. The color shift correlates with the amount of pressure used — blue turns purple after moderate impact and red with a hard hit. This nuanced response yields information about different pressure levels the gold film encounters. The possibilities seem limitless, from sports to scientific studies to fashion.
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