Color was measured using Chroma Meter CR-300, Konica Minolta,
Japan with granular materials attachment. The instrumentwas
calibrated using white standard calibration plate and color was
expressed in CIE-Lab parameters as L* (whiteness/darkness), a*
(redness/greenness) and b* (yellowness/blueness) and in CIE-LCh
parameters as C (Chroma) and h (hue). The total color change
(DE) was calculated as: