Hue angle gives a numerical estimate of the colour of the cookies. The hue sequence on a CIELAB
diagram is defined with red-purple (0°), yellow (90°), bluish-green (180°) and blue (270°) [31]. Both cookies containing 15% of pre-gelatinized flours (hue angles of 82.6°) showed higher hue angles than
those containing 30% of pre-gelatinized flours (hue angles of 76.7° and 78.1° for PBF and WBF,
respectively). Decrease in hue angle values were observed according to increase of flour content on
formulation, with the cookies becoming less orange/yellow (Table 3). Differences in hue angle could be
attributed to interaction of some pigments of pre-gelatinized flours with other compounds in the
formulation. The coloured compounds of black bean grains may have contributed to the final colour of
the cookie.
Regarding texture measurements, the cookies prepared with 30% WBF presented highest (p