An infrared radiation reflecting substrate, having deposited thereon a first layer formed from a metal or an alloy, and a second layer deposited on the first layer and consisting of a solar radiation absorbing amorphous material, such as amorphous carbon. The substrate can be formed from an infrared...http://www.google.com.au/patents/US4504553?utm_source=gb-gplus-sharePatent US4504553 - Covering for photothermal conversion
