The quality of Photocatalyst (i.e. product efficiency) is mostly determined by the TiO2 level in materials; which means, the more TiO2 it contains, the better quality and efficiency it will have. The TiO2 concentration in Nanoyo Photocatalyst materials reaches 30% and it obviously has an edge over other Photocatalysts with a TiO2 level less than 1%. TiO2 is white and of solid state, so TiO2 concentration in material can be judged from its appearance.

When the TiO2 level is low, the material is transparent and watery; however, it will become white once TiO2 is over 10%. The more TiO2 it contains, the thicker the material will be. The TiO2 concentration of Nanoyo Photocatalyst reaches 30%, thus it looks like thick milk.