Regarding color parameters, the reduction of lightness and
redness in KLBs could be explained by the browning processes
occurring during fermentation. This phenomenon is due to the
activation of certain oxidases, such as polyphenol oxidase, when
the environments are not completely anaerobic (Corona, 2010).
Considering the just noticeable differences limit of 2.3 on a human
perception scale reported by Mahy et al. (1994), all the samples
changed their colors (DE) after the fermentation process. The most
noticeable changes were for prickly pear, pomegranate and grape
KLBs.