Table 2.

Film color properties and opacity.

Film type	L*	a*	b*	∆E	WI	OP
IPPF-2.5%	29.278 ± 0.365	4.210 ± 0.185	6.645 ± 0.482	30.321 ± 0.396	28.840 ± 0.354	1.711 ± 0.034
IPPF-3.0%	28.075 ± 0.189	4.122 ± 0.121	5.208 ± 0.512	28.854 ± 0.262	27.767 ± 0.167	2.538 ± 0.027
IPPF-3.5%	27.290 ± 0.177	3.722 ± 0.094	3.492 ± 0.290	27.765 ± 0.147	27.111 ± 0.189	3.065 ± 0.037
IPPF-4.0%	26.452 ± 0.116	3.028 ± 0.119	2.455 ± 0.150	26.738 ± 0.128	26.348 ± 0.112	3.379 ± 0.037