KNOxOUT is an air cleaning paint, using the CristalActiv photocatalytic technology. The ‘eco-active’ paint uses light energy to convert noxious gases into harmless substances. Ultrafine titanium dioxide (TiO2) absorbs energy from light and transforms ordinary water vapor into hydroxyl and peroxyl radicals at the surface of the TiO2. These free radicals become the reactive species that break down noxious air pollutants such as nitrogen oxides (NOx). A great advantage of this photocatalytic reaction is that the titanium dioxide is not consumed in the reaction, but is merely a catalyst that continuously generates free radicals as long as there is sufficient light, air and moisture. Not only does the photocatalysis break down the noxious air pollutants, the technology also provides KNOxOUT with self-cleaning, anti-bacterial and de-odorizing properties. The vehicle of the air cleaning paint is silicone. It can be applied where exterior durability requirements are demanding.