Exploratory Investigation of Chitosan as Mordant for Eco-Friendly Antibacterial Printing of Cotton with Natural Dyes

Table 1

Effect of mordants and catechu concentration on color strength of cotton.

Mordant (%)	Catechu	Colour value	CIE colour coordinates			Washing fastness		Light fastness
	(%)	𝐾/𝑆	𝐿^∗	𝑎^∗	𝑏^∗	Change	Staining
Alum
10	1	0.2514	81.626	4.566	8.739	5	5	6
10	5	0.6024	83.211	4.991	11.255	5	4-5	7
10	10	1.0746	83.757	5.434	12.167	4-5	4-5	7
20	1	0.299	82.104	3.562	8.851	4-5	4-5	6
20	5	0.5852	83.216	5.055	11.454	4-5	4	7
20	10	1.1067	83.842	5.752	12.448	4	4	7
Chitosan
10	1	0.3363	79.477	4.235	9.042	5	5	6
10	5	0.5287	78.845	6.323	8.972	5	5	6
10	10	1.0201	79.248	7.689	10.13	4-5	4-5	7
20	1	0.4182	78.529	4.718	7.628	4-5	4-5	7
20	5	0.8044	79.117	7.286	9.349	4-5	4-5	7
20	10	1.3245	79.183	8.214	9.867	4-5	4	7
Copper sulphate
1	1	0.7087	72.994	6.824	14.267	4-5	5	7
1	5	1.6571	71.891	9.586	13.176	4-5	4-5	7
1	10	3.0619	73.111	9.882	14.614	4-5	4	7
2	1	0.6359	72.575	6.913	13.488	4	4-5	7
2	5	3.7264	73.109	10.569	14.928	4	4	7
2	10	3.7948	72.734	10.114	14.604	4-5	4	8