When a “self-cleaning” surface is exposed to a suitable light source, the photocatalytic agents on the surface generate highly reactive species which are capable of oxidising any organic materials in contact with the surface, converting them to carbon dioxide and mineral acids which are easily washed away.
Our proprietary ink is formulated specifically to take advantage of the photocatalytic process. Normally, a dye on the surface of a photocatalyst would be oxidised like any other organic material. However, other more easily oxidised ingredients within the ink allow the dye to be chemically reduced instead. The end result is that, instead of being destroyed, the dye within the ink is transformed and simply changes colour.
For more information on photocatalyst materials you may want to try: