Table 2.
Color changes of the Re-WDF with sappan wood at different pH

pH	K/S at 450 nm	Hunter's Value				Munsell's Value
		L*	a*	b*	ΔE*	H	V	C
		4.5	1.53	70.69	10.31	30.44	11.10	9.4YR	7.01	5.10
7.5	1.60	70.06	10.80	30.52	11.70	9.2YR	6.94	5.16
9.1	2.32	67.03	13.07	34.62	17.27	8.9YR	6.65	5.94
11.0	1.52	65.64	9.42	22.16	11.23	8.0YR	6.47	3.96
12.3	1.28	67.10	8.25	20.41	9.62	8.1YR	6.61	3.58

pHs are adjusted with 0.1M NaOH solution
Dyeing conditions : Sappan wood : 50 g/L, Temperature : 60 °C, Time : 60 minutes