Wax-based electrophoretic rewritable media have been investigated since they potentially have good preservation characteristics. Reducing the thickness of rewritable media is critical for reducing the writing/erasing energy of wax-based rewritable media. The present study investigates the effect of rewritable media thickness. Samples of with dye concentrations of 0, 0.03, and, 0.07 wt. % and TiO2 concentrations of 2.5, 5, and 10 wt. % with respect to wax were prepared with media thicknesses of 0.05, 0.1, and 0.2 mm and their rewritable characteristics were evaluated. The Kubelka-Munk equation was applied to investigate the dependence of the reflection of the dyed side on the dye and TiO₂ concentrations and the absorption coefficient of the dye was estimated. It was found that a TiO₂ concentration of 5 wt. % and a dye concentration of 0.07 wt. % give suitable display characteristics for cells with thicknesses of 0.1-0.2 mm. A preliminary rewrite experiment was performed on an enlarged dot cell.