HYDROXYNAPHTHOL BLUE METAL (PM) INDICATO

2,2'-DIHYDROXY-1,1'-AZONAPHTHALENE-3,4,6'-TRISULFONIC ACID TRISODIUMSALT

2-Hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-3,6-naphthalenedisulfonic aci

1-(2-NAPHTHOLAZO-3,6-DISULFONIC ACID)-2-NAPHTHOL-4-SULFONIC ACID DISODIUM SALT