TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The layer comprises at least one of: a1) a photocatalyst and/or n-type semiconductor having a band gap in the range of 3.1-4.1 eV; b1) a photoconductive material/composition; and/or c1) a photocatalytic material/composition; optionally comprising at least one catalyst selected from TiO2, ZnO, WO3, SnO2, CaTiO3, Bi2S3, Cu2O, Fe2O3, ZrO2, SiC and/or TixZr(1-x)O2; optionally doped with at least one co-catalyst, where the co-catalyst is selected from palladium, platinum, rhodium, ruthenium, tungsten, molybdenum, gold, silver, copper, including any of their oxides and/or sulfides, and any combination/mixture/ratio of at least two of palladium, platinum, rhodium, ruthenium, tungsten, molybdenum, gold, silver, copper, including any of their oxides and/or sulfides; where the molar ratio of co-catalyst to catalyst is less than 3%. The photocatalyst and/or n-type semiconductor has a band gap of around approximately 3,2 eV ( approximately 388 nm), and/or the photocatalyst and/or n-type semiconductor is doped with at least one N-, S-, and/or F-atoms. The photocatalytic material is covalently bound to the beads/particle; where the photocatalytic material coated on the beads optionally has a crystal size of 1-150 nm; and the photocatalytic material coated on the beads optionally has a specific surface area (e.g. BET surface area) of 0.01-100 m2/g. More than 99% (weight/weight) of the TiO2 in the photocatalytic layer is in the catalytic active form of anatase. The electromagnetic radiation comprises radiation with a wavelength in the range of less than or equal to 388, and/or a wavelength corresponding to the band-gap of the photocatalyst and/or n-type semiconductor, or a wavelength shorter than the band-gap of the photocatalyst and/or n-type semiconductor.x=greater than 0 to less than 1.    TECHNOLOGY FOCUS - POLYMERS - Preferred Paint: The paint is alkyd-, acryl-, polyurethane-, epoxy-, and/or co-polymer-based. Preferred Components: More than 95% of the particles have an equivalent diameter of 0.5-20 mu m. The beads or particles are coated with a photocatalytic layer providing photocatalytic activity, where the layer and/or photocatalytic activity providing at least one of: a) reduction in growth of (micro)organisms, such as at least one of: bacteria, algae, lichen, yeasts and/or moulds; b) increase in adhesion strength between an organic binder and a bead by chemical bonding; c) increase in abrasion resistance of the paint film; d) increase in weather resistance and/or UV-stability, such as at least one of: i) reduction of chalking of an organic binder; ii) reduction of decomposition of an organic binder; and/or iii) reduction of release of (photocatalytic) material and/or material with a particle size of less than 1 mu m; e) decomposition and/or oxidation of undesired organic matter and/or dirt and/or f) improvement of wetting property of the paint. EXAMPLE - A coating composition comprising S38 hollow glass microsphere coated with an anatase titanium oxide (TiO2) was prepared as follows. Photocatalytic TiO2 was coated onto S38 hollow glass microspheres, produced by 3M, with an average/mean size of 40 mu m and an average/mean density of 0.38 g/cm3, by treating the microspheres with, a titanium-tetraisopropoxide (TTIP), followed by calcining the product afterwards to crystallize the titanium. The coating procedure was as follows: TTIP was dissolved in isopropanol and the ratio of isopropanol to TTIP was 10:1 by volume. The glass beads were pre-treated by heating them to 160 degrees C for 4 hours and then coated immediately after being removed from the oven. After stirring for 20 minutes the S38 hollow glass microspheres were added to the solution in the ratio 1 g glass spheres to 1 ml TTIP and stirred for 20 minutes. After work-up, a coated composition was obtained.