Analysing the total colour difference DE value, it can be concluded
that the material subjected to ultrasound caused significant changes (Table 3). The DE in carrot described the changes in regard
to colour of untreated material. According to Tiwari et al. [47] the
total colour difference value higher than 2 conforms to visible difference.
All samples treated with ultrasonic waves had similar
value of DE and it was in the range from 4.91 to 6.73. Moreover,
all dried samples were characterized by high value of colour difference
DE, what means that drying process had huge impact on the
samples colour. Material subjected to drying, regardless of the used
parameters of ultrasound treatment, showed a visible difference in
comparison to the raw carrot (Table 3).