Antifungal properties of TiO₂ and ZnO nanoparticles were assessed in polyvinyl butyral. The photocatalyst activity of TiO₂ and ZnO nanoparticles were detected for creation of antifungal properties and protection against environmental factors in PVB consolidant.

Treated samples with 1% of nano-TiO2 and nano-ZnO in 5% PVB under darkness conditions did not show antifungal properties, but 2% of nanoparticles protected against the fungus in darkness conditions. There was an appropriate preservative properties of all treatments in light condition.

Increasing the amount of TiO₂ nanoparticles in PVB cause yellowing in the consolidated wood with nanocomposite and should be avoided further nanoparticles. Combination of TiO₂ and ZnO of nanoparticles showed the best result.