prov:value
| - Suitable oxidizing agents include persulfates including for example ammonium persulfate (APS), potassium persulfate (KPS) and sodium persulfate, preferably APS or KPS. Suitable reducing agents include sulfites, such as sodium sulfite, sodium bisulfite, a metabisulfite such as sodium or potassium bisulfite, pyrosulfites and thiosulfites, preferably Na2S2O5, metal ions such as copper, iron, and silv
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