We report the effect of easy axis producing on isotropic polymer surface in cells with dye-doped liquid crystal (LC) irradiated with visible polarized light. We showed strong dependencies of the fight-induced anchoring on the time passed from the cell's filling with LC. The cells made from the reference rubbed aligning surface and the tested isotropic surface and filled with doped LC were irradiated with light with polarization set at 45degrees to the rubbing direction. Twist structures resulted due to light-induced easy axis on the tested surface were studied. The twist angle decreased exponentially with cell's age. We believe that this behaviour is due to the anisotropic dark adsorption of dye on the substrate and formation of "dark' easy axis, which influences on the light-induced anchoring. This model is supported by experiments on time changes of cell's conductivity, surface plasmon resonance angle and the anchoring memory effect in a not-irradiated cell.