Interaction of Natural Dye (Allium cepa) with Ionic Surfactants

Table 1

Spectroscopic data for the interaction of dyes with surfactants at 25°C.

Surfactant	Surfactant added (g/L)	λ max and absorbance of dye (1.0 g/L)
		λ max ± 2; (nm)	(Absorbance); ±0.02 at λ max
NaLS	Nil	535	.36
	0.05	540	.41
	0.10	540	.44
	0.15	540	.46
CTAB	0.05	545	.42
	0.10	545	.45
	0.15	545	.48