It was found that when inlet temperature increased, the +b*
values increased but the +a* values increased then decreased at
175 ◦C. This contributed to the changes in hue angle and chroma
(Table 3). Overall, the lightness of the powders reduced and the
chroma of the powders increased. This implied that the colour of
the powders has become darker at higher inlet temperature. One
of the explanation for this phenomenonwaswatermelon contains