Which color of paint has a solar reflectance of one?

In the context of solar reflectance, a value of one (1) represents a surface that reflects all solar energy and absorbs none. This is theoretically the maximum solar reflectance possible and is most closely associated with a perfectly reflective white surface. In practice, materials with very high solar reflectance values, close to one, are typically white or very light in color. On the other hand, black has a solar reflectance of nearly zero, meaning it absorbs almost all solar energy. Gray shades have intermediate values depending on their lightness or darkness.