Pleotint’s technology is a self-tinting film for use in windows. The patented technology allows Pleotint to exclusively produce Sunlight Responsive Thermochromic (“SRT™”) films that tint in the presence of direct sunlight to block heat, glare and ultraviolet light. The variable light transmission tinting requires only that it be heated by direct sunlight; there are no wires, electrodes, power supplies, or control apparatus required (i.e., the system is completely sunlight activated). When the direct sunlight is no longer present, the film returns to its original high transmission condition. A graph showing the tinting of prototype Pleotint SRT™ windows due only to sunlight exposure is shown below.  The graph shows that each window tints at a time, with an appropriate amount of tinting in relation to the amount of sunlight and the orientation of the window.