Table 6.

Trichromatic coordinates of the cotton knit treated with TiO₂-1% Fe-N (Samples 1 and 2), stained with 0.01 g/L MB and coffee and exposed to solar light.

Sample	L*	a*	b*	dL*	da*	db*	dE*	dC*	dH*	Grades
Control cotton knit stained with MB	85.7	−3.41	−4.67	4.85	5.59	4.58	8.71	−7.13	1.21	1.5
Cotton knit ITO-MB	78.79	−10.54	−11.62	0.08	9.36	4.93	10.58	−10.20	2.83	1.50
HT1-MB	88.5	−1.68	−2.87	5.93	11.48	7.19	14.79	−13.24	2.86	1
HT2-MB	85.36	−3.02	−2.4	1.58	7.77	6.53	10.27	−10.15	−0.14	1.5
Control cotton knit stained with coffee	69.48	8.07	26.77	0.23	−1.08	−3.57	−3.73	0.01	1.01	3.5
Cotton knit ITO-coffee	68.44	7.21	24.32	−1.43	−0.64	−3.35	3.70	−3.40	−0.32	3.00
HT1-coffee	78.17	4.64	21.04	2.54	−0.59	1.25	2.9	1.08	0.87	3.5
HT2-coffee	80.26	3.71	17.58	5.8	−2.16	−3.38	7.05	−3.8	1.29	2