The Complete List of Suppliers for 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-, diazotized, coupled with diazotized 2-((4-aminophenyl)amino)-5-nitrobenzenesulfonic acid, diazotized 2-chloro-4-nitrobenzenamine and 5,5-oxybis(1,3-benzenediol), sodium salts