These conclusions relating to the effect of salt
and urea on the two dyes can also be drawn from
an examination of the relationship between the
change in molar extinction coecient (d) of both
the soluble aggregate and monomeric species with
dierent concentrations of additive.
(i) Influence of salt on molar extinction coecient: If aw is molar extinction coecient of the soluble aggregate in water, as molar extinction