. 2019 Aug 29;11(9):1418. doi: 10.3390/polym11091418

Table 3.

Colour difference and opacity.

Films	L*	a*	b*	WI	Opacity
Control	66.43 ± 0.09 ^a	4.69 ± 0.23 ^a	8.67 ± 0.51 ^a	65.01 ± 0.15 ^a	0.74 ± 0.12 ^a
1% TiO₂	78.29 ± 0.16 ^a	5.30 ± 0.09 ^a	13.86 ± 0.79 ^b	73.70 ± 0.12 ^a	9.02 ± 0.18 ^b
3% TiO₂	81.33 ± 0.24 ^a	5.96 ± 0.24 ^a	13.56 ± 0.84 ^bc	76.17 ± 0.29 ^ab	19.4 ± 0.11 ^c
5% TiO₂	82.36 ± 0.09 ^a	6.14 ± 0.10 ^a	12.65 ± 0.42 ^bc	77.44 ± 0.31 ^b	29.3 ± 0.24 ^d
7% TiO₂	83.11 ± 0.09 ^a	6.21 ± 0.53 ^a	12.44 ± 0.72 ^bc	78.12 ± 0.15 ^b	34.6 ± 0.37 ^e
3% TiO₂–3% CO	78.42 ±0.07 ^a	6.98 ± 0.12 ^a	16.47 ± 0.11 ^c	72.51 ± 0.14 ^b	22.4 ± 0.31 ^c
3% TiO₂–6% CO	77.77 ± 0.47 ^a	7.95 ± 0.18 ^a	17.72 ± 0.84 ^bc	70.48 ± 0.39 ^ab	24.4 ± 0.14 ^cd
3% TiO₂–9% CO	77.44 ± 0.17 ^a	8.68 ± 0.11 ^a	19.50 ± 0.14 ^bc	68.94 ± 0.42 ^ab	25.8 ± 0.22 ^cd
3% TiO₂–12% CO	77.24 ± 0.09 ^a	8.87 ± 0.36 ^a	19.52 ± 0.33 ^b	68.73 ± 0.45 ^a	26.9 ± 0.34 ^cd

Different letters in the same column indicate significant differences among formulations (p < 0.05).