The color (L a* b*) values of the crackers were determined
by Hunter, Lab Scan XE – Reston VA, USA. The crackers
were ground prior to color analysis. The instrument was standardized
each time with white tile of Hunter Lab Color Standard.
The lightness (L*), redness (a*) and yellowness (b*) of the
samples were recorded. The value taken was an average of
three readings. The total color difference (DE) between the
control and the HSR containing crackers was calculated as
follows:
DE ¼ ½ðLc LsÞ þ ðac asÞ þ ðbc bsÞ1=2
where subscript c = control and subscript s =samples containing
HSR.