Toners were taken photograph with the SEM. Based on the information about 20 toner powder data from pictures,
size information (average diameter ± standard deviation) was obtained. And major axis (transverse diameter) of
particle, L, and minor axis (conjugate diameter), W, were measured, and averaged them. When a particle is spherical,
its L/W is equal to 1. Average diameter of toner was also measured with the laser diffraction