Where I can find the ultraviolet reflectivity index of various colors? How about the heat absorption index for various colors?
Unfortunately I can’t help you. While there might be some correlation between UV and IR absorption and an object’s color (absorption in the visible), it is not perfect and colors can have one property in the visible wavelengths and different in the UV and IR. In general, colors that reflect more light in the short-wavelength regions of the visible spectrum are more likely to reflect more UV as well. These would be blues and purples. Likewise, colors that reflect in the long-wavelengths (yellows, oranges, reds) are also likely to reflect a lot of IR (and therefore absorb more heat). The IR end is much more difficult to predict however. An object heating up is not just because it absorbs IR (regardless of wavelength) but also because it absorbs other wavelengths. For example, black objects that absorb all the visible wavelengths will heat up more than white objects that reflect all visible wavelengths (assuming their behavior at non-visible wavelengths. is similar.
