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The SPD-SmartGlass product is composed of nanoparticles in a film which allows control of the tint in a panel of glass, ranging from 0.5% transparency (meaning very dark) to 100% clear. This control may be automatic or user-activated. This technology was developed by Research Frontiers, which has been licensed by Hitachi. Mercedes in turn has announced that the new Mercedes-Benz SLK will be the first large-scale series production vehicle to use Research Frontiers’ patented SPD-SmartGlass technology.