Table 2.

Color analysis of CS+RGEO films.

Sample	L*	a*	b*	a*/b*	ΔE
F1	58 ± 1 a	−1.2 ± 0.1 a	9 ± 2 a	−0.14 a	-
F2	54 ± 3 b	−0.9 ± 0.3 a,b	12 ± 4 b	−0.085 b	6 ± 4 a
F3	50 ± 2 c	−0.4 ± 0.6 c	16 ± 3 c	−0.030 c	10 ± 3 b
F4	52 ± 2 b,c	−0.6 ± 0.7 b,c	18 ± 5 c	−0.043 b,c	11± 5 b

Note: Lightness (L*) and chromaticity parameters a* (red to green) and b* (yellow to blue) were used to characterize the film color in the Hunter Lab-scale (CIE Lab scale). ΔE is the total color difference. Values are expressed as mean ± standard deviation. Different letters in the same column indicate significant differences (p < 0.05). The different formulations: CS (F1); CS+RGEO 0.5% (F2); CS+RGEO 1.0% (F3); and CS+RGEO 1.5% (F4).