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Ammonium thiosulfate is a kind of Colorless transparent liquid, which be used in photo application. Spec for ammonium thiosulfate as below: ItemsSpecifications:Color (pt-Co Scale)15 MaxAssay56~60Ammonium sulfite 1.0 MaxAlkalinity0.3~1.5Insoluble matter ( precipitation of Ca and Mg)0.2 MaxIron 0.00025 MaxSulfide(as S)0.0002 MaxIgnition residual0.1 MaxDensity at 20 oC1.32-1.335Heavy metals(as Pb)0. ...