While the human eye is sensitive to only a small part of the electromagnetic spectrum, pigment interactions with wavelengths outside the visible can have interesting effects on coating properties. One key area of the spectrum is the infrared (IR), specifically the near infrared. While not visible to the human eye, a pigment's, and thus a coating's IR properties can affect usability and durability.
The primary purpose of IR-reflective coatings is to keep objects cooler than they would be using standard pigments. This IR-reflective feature is the basis for their use in markets like Cool Roofing for the EPA's Energy Star Program1 and the California Energy Commission2 Title 24 2008 version. This technology is also finding use in transportation and other areas where the ability to stay cool is a valuable benefit.