1,2-Dihydroxybenzene-3,5-Disulfonic Acid Disodium Salt

**Definition:** A colorimetric reagent for iron, manganese, titanium, molybdenum, and complexes of zirconium. (From Merck Index, 11th ed)

**Tree numbers:** - D02.455.426.559.389.097.175 - D02.455.426.559.389.657.166.210 - D02.886.645.600.080.050.100.150