Many paints contain special additives such as biocides which act as a prevention against biodeterioration. Presence of nanoparticles of silver and copper may inhibit the grow of microorganism. Self cleaning facade paints containing photocatalytic particles (mostly TiO2) appear also on the market. Such paints are after irradiation of sunlight no to susceptible to soiling and thus help to keep exterior of building clean. Another type of paints is prepared with aim to improve air quality in exterior via photocatalytic oxidation organics compounds such as acetaldehyde, formaldehyde etc. This contribution deals with the application of ZnO particles to water based acrylic paints. The objective is to determined antifungal capability against A. niger. Attention will be also paid to determination of photocatalytic activity. Photocatalytic activity will be determined using indicator ink containing Resazurin dye. This method is based on observation of color change from pink to blue which occurs on photocatalytic surface.Keywords: Self-cleaning, ZnO, Aspergillus niger, photocatalysis
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