Table 1.

Color indices of fabrics treated in scCO₂.

Sample Name	L*	a*	b*	ΔE	Stensby Whiteness Index
Untreated PET	95.98	−0.23	1.36	–	91.21
PET (6 h)	95.05	−0.20	1.46	0.94	90.07
PET-HA (1 h)	94.91	−0.21	1.44	1.07	89.96
PET-HA (3 h)	94.42	−0.17	1.52	1.57	89.35
PET-HA (6 h)	93.26	−0.10	1.88	2.77	87.32
PET-HA (6 h)-Cl	96.04	−0.21	0.99	0.38	92.44

L: Lightness indicates, a: Red/green coordinate, b: Yellow/blue coordinate, ΔE: Total color difference.