... . Adopt CIE 1964 supplementary standard colorimetric system and CIE 1976(L*a*b) color space and color difference formula.(2) Adopt d ... value X10, Y10, Z10, chromaticity coordinate X10, Y10, lightness L*, chrominance a*, b*,chromaticity C*ab, hue angle h*ab, dominant wavelength ... difference C*ab, hue difference H*ab, Hunter system L, a,b.(2) Measure yellowness YI(3) Measure opacity op(4) ...