Abstract: The natural mica slice was coated with TiO₂ by the homogeneous precipitationmethod in which titanyl sulfate(TiOSO₄) and urea were used as raw material.The forma-tion of the thin film and the technological factors influencing the film structure were studied.The adjustment of the temperature and time of the precipitation reaction in various stagesfavoured the control on the morphology of precipitated particles and the thickness of film layer,resulting to even and dense films.Owing to the optical interference effect,films with different thickness display various color.

Key words: mica slice, TiO₂ thin film, homogeneous precipitation