or a functional layer the colorants are dissolved or dispersed in the composition another aspect of the present invention is directed to a method for adjusting the color temperature of an electrophoretic display in the present method the color spectra of an electrophoretic display are first obtained a uv vis spectrometer can be used to obtain the absorption spectra of liquid particle dispersion or the absorption spectra of functional layers while colorimeters can be used to determine the reflectance of a display in addition to the spectra a cie l a b color space system may also be used to determine the color temperature of the display the details of the cie l a b color space system are given in u201c understanding color management u201d by abhay sharma delmar cengage learning first edition aug 11 2003 the content of which is incorporated herein by reference in its entirety following the method of the present invention the u201c a u201d value in the cie l a b color space system may be achieved between 3 and minus 6 i e u2212 6 preferably between 0 and minus 3 i e u2212 3 more preferably between 0 and minus 1 5 i e u2212 1 5 and the u201c b u201d value may be achieved between 4 and minus 5 i e u2212 5.