... diffuse reflectance factor Rx, Ry, Rz IntroductionZB-A colorimeter machine is the professional instrument to test the object of the ... , light scattering coefficient,optical absorption coefficient, and ink absorption value.It is widely applied in paper, cardboard textile, painting ... object , report diffuse reflectance factor Rx, Ry, Rz;stimulus value X10, Y10, Z10;chromaticity coordinate x10, y10, z10; ...