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From Biology-Online Dictionary
(Science: chemical) 4,5-dihydroxy-1,3-benzenedisulfonic acid disodium salt. A colourimetric reagent for iron, manganese, titanium, molybdenum, and complexes of zirconium.
Pharmacological action: indicators and reagents.
Chemical name: 1,3-Benzenedisulfonic acid, 4,5-dihydroxy-, disodium salt