... report diffuse reflectance factor Rx, Ry, Rz IntroductionZB-A Colorimeter lab equipment is the professional instrument to ... chromaticity coordinate x10, y10, z10;lightness L*;chrominance a*, b*;chromaticity C*ab;hue angle h*ab ... standard colorimetric system and CIE 1976 (L*a*b) color space and color difference formula.3 ... 30min4.Repeatability:Rx Ry and Rz s≤0.01 ,chromaticity coordinate s≤0.0010,.R457 s≤ ...