Table 2. Total change in colour (∆E), chroma (∆C), lightness (∆L*), green-red coordinate (Δa*), and blue-yellow coordinate (Δb*) for composite samples stained in various solutions and compared to baseline samples.

	∆E	∆C	∆L*	∆a*	∆b*
Tea	4.31	4.02	1.56	0.00	−4.02
Coffee	6.61	6.29	2.03	0.42	−6.28
Red wine	6.22	3.92	4.83	−0.86	−3.82
Coca-Cola	1.29	1.29	0.00	0.48	−1.19
Colgate	0.89	0.82	0.02	0.46	−0.68
Water	0.82	0.70	0.43	0.54	−0.44