https://www.laserfocusworld.com/optics/article/16558218/subambient-optical-coating-lowers-summertime-roof-temperature-to-11-degrees-c-below-that-of-a-white-roof
'Subambient' optical coating lowers summertime roof temperature to 11 degrees C below that of a...
The coating consists of a combination of polyesters on a silver thin-film layer.
optical coatingsubambientlowerssummertimeroof