A 0658 (OTTO) 8-Anilino-1-naphthalenesulphonic acid ammonium salt, for fluorescence, ≥97% (HPLC) Cas 28836-03-5 - used as a fluorescence probe to investigate molecular assemblies of surfactants and amphiphilic polymers because a blue shift of the emission maximum indicates the fluorophore is located in less polar media.