... , report diffuse reflectance factor Rx, Ry, Rz IntroductionZB-A Colorimeter lab equipment is the professional instrument to test the object of the ... coordinate x10, y10, z10;lightness L*;chrominance a*, b*;chromaticity C*ab;hue angle h*ab;dominant wavelength λd, excited purity ... , color difference ΔE*ab, lightness difference ΔL*, chromaticity difference ΔC*ab, hue difference ΔH*ab, Hunter system L, a,b ...