One scan of 8 slices per replicate was acquired with a speed of 0.05 mm s−1 in a dark room with a stabilized halogen light source (150 W). On each fennel slice, regions of interest (ROI), were manually selected, one on the stem and one on the sheath, as the maximum subscribed rectangle, allowing to calculate in the reflectance mode, the CIE L*, a* b* scale color parameters. Hue angle (h° = arctan ) and saturation (Chroma = ) were calculated from a* and b* values.