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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. Interestingly enough, nanogold was used hundreds of years ago to produce vivid colors. Medieval masters of producing stained glass windows used nanoparticles of gold to achieve bright red colors and silver