Six kinds of mixtures were investigated. These mixtures were composed of two kinds of individual powders, respectively. One was wheat flour. The other was corn, soybean, defatted soybean, defatted wheat germ, oat or buckwheat flour. In Fig. 1, the relation between HW of these six mixtures and mass fraction (w/w) of their changed individual powders is presented. From these results, we can conclude that no matter what the individual powder was, and there was a very good correlation (R2 > 0.99). A linear equation was derived from these experimental results leading to a satisfactory correlation between HW of mixed powder and MP of individual powder. The linear equation can be expressed as