The change became severe when the exposure was prolonged. This is illustrated by the
steep slope ofthe plot between the beginning of day 3 and day 4. At the begirming of day 4,
i.e. after one day of exposure to ambient temperature, the hue value dropped to below 60°,
which corresponded to brown in the HSI colour chart. Meanwhile, no change was observed
on the control samples. The slight decrease that was shown in the hue value on the control
samples was basically due to the normal ripening process.