Applying brightness, whiteness, and color measurements to color removal
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Brightness measurements alone are not enough to evaluate how efficiently color is removed from pulp. Whiteness measurements and color data are also needed but are more difficult to interpret. CIE L*a*b* is the most commonly used color system, but CMC color difference mathematics may be needed as well. Absorption coefficients give the bleaching chemist an objective way to measure the amount of colorant remaining after each stage of color removal. Application : various optical measurements may be applied to separate the variables that affect color removal, giving the bleaching chemist a better understanding of the decolorization process.