Table 1.

Mean and standard deviations of color parameters for all experimental conditions.

	ΔL		Δa		Δb		ΔE
	1 session	2 sessions	1 session	2 sessions	1 session	2 sessions	1 session	2 sessions
3 × 10 min	−0.60 ± 2.74	−0.50 ± 2.14	0.96 ± 0.53	0.48 ± 0.36	−3.00 ± 1.15	−4.73 ± 1.02	4.19 ± 1.24	5.24 ± 1.00
1 × 30 min	−1.07 ± 1.88	−1.30 ± 1.86	1.17 ± 0.56	0.81 ± 0.49	−2.82 ± 1.03	−4.52 ± 0.86	3.78 ± 0.96	5.14 ± 0.82
1 × 40 min	−1.11 ± 2.55	−1.11 ± 2.06	1.41 ± 0.62	0.70 ± 0.65	−3.27 ± 1.26	−5.19 ± 1.15	4.53 ± 1.27	5.77 ± 1.08