2.4. Color
A chromaticity instrument (CR-400, Onica Minolta Co., Japan)
was employed to measure the surface color of the samples. A white
standard board was used for calibration. The color values were
expressed as L* (whiteness/darkness), a* (redness/greenness) and
b* (yellowness/blueness). Fifteen crackers were analyzed for each
substitution level and each cracker was analyzed at three different