Synonyms: 1,5-Naphthalenedisulfonicacid, 2-[(6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]-, reaction productswith 2-[(6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]-1,4-benzenedisulfonicacid, 1,2-propanediamine and 2,4,6-trifluoro-1,3,5-triazine, sodium salts