Siehe Bemerkung 9) zur Tabelle in 2.4.2.3.2.3:
"This entry applies to mixtures of esters of 2-diazo-1-naphthol-4-sulphonic acid and 2-diazo-1-naphthol-5-sulphonic acid meeting the criteria of 2.4.2.3.3.2 (d)."