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Code: km-286 Product name: Alizarin yellow R CAS No. 2243-76-7 MF: C13H8N3O5Na MW: 309.21 Assay: 90%min PH indicator range: 10.0(yellow)—12.0(red) Water soluble test: qualified Residue on ignition(as sulfate): 20.0—25.0%