The spectral comparison method has been developed for the measurement of temperatures of both the gas and condensed phase in a flame. This method utilizes measurements of spectrum line emission from the gas and continuum emission from particle cloud to allow determination of the temperature of both phases. The method accounts for the effect of scattering by the particle cloud through measurements of effective particle size and number density used in conjunction with the Mie theory. The measurement precision for this method for a clean gas was determined from measurements on a H2O2 flame the resulting standard deviation in gas temperature was 16 K. With particles of alumina introduced into the flame, the standard deviation in gas temperature was increased to 40.8 K. For the particle temperature the standard deviation was 140 K, a relatively high value because of the uncertainty in the refractive index of molten alumina. The first spectral line of the sodium doublet 0.589 micron was assessed to be a good indicator of the gas temperature in flames. This was determined by a comparison to the lithium line at 0.6708 micron which is associated with an electron transition of longer radiative lifetime.