2,4-Bis[[2,6-dihydroxy-3-[(4-nitrophenyl)azo]phenyl]azo]benzenesulfonic acid sodium salt

4-Nitrobenzenamine diazo, Coupled with resorcinol, its product (2 Moore) and double the nitride 2,4-Diaminobenzenesulfonic acid coupling.

yellow light brown. Soluble in water for yellow light brown. The strong sulfuric acid is palm in orange, diluted into yellow brown. In water solution to join strong hydrochloric acid produce brown yellow light precipitation.