The color analysis of the fiber samples was performed with a
colorimeter (Minolta, CR400, Japan) following the color system of
the CIE-L*a*b*, where the L* value (brightness) ranges from black
(0) to white (100), the chroma a* value ranges from green (60) to
red (þ60) and the chroma b* value ranges from blue (60) to yellow
(þ60). The chroma C* value and the hue angle (hab), referred to
as the color system CIELCh according to Minolta (1993), were
calculated by Eqs. (1) and (2)
The color analysis of the fiber samples was performed with acolorimeter (Minolta, CR400, Japan) following the color system ofthe CIE-L*a*b*, where the L* value (brightness) ranges from black(0) to white (100), the chroma a* value ranges from green (60) tored (þ60) and the chroma b* value ranges from blue (60) to yellow(þ60). The chroma C* value and the hue angle (hab), referred toas the color system CIELCh according to Minolta (1993), werecalculated by Eqs. (1) and (2)
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