When the weight reduction in predehydration increased, the
L values decreased and values of a and b increased, which
could be due to extended IR drying time causing browning.
The results indicated that the yellow color developed at high
weight reduction level with IR heating. When the acid dipping
treatment was used, the samples had much whiter appearance
compared to the undipped samples. Such color appearances
can also be seen in Fig. 7. Likewise, the regular FD sample
has less yellowness than the SIRFD samples. The results of reduced
discoloration in acid dipped slices were similar to that
observed in the study of air drying of Dwarf Cavendish and
Gros Michel banana slices by Demirel and Turhan (2003).