“…For example, acridine orange in organic glasses and in EtOH at 77 K [22,23], rhodamine dyes Rh-6G [7], Rh-19 [24], and Rh-B [25] in ethanolic and aqueous solutions, Cresyl Violet in water [26] form aggregates. For fluorescein-Na, in alkaline aqueous solutions at 1 Â 10 À1 mol dm À3 , dimeric species has been reported [21].…”