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Cobalt oxide paper
Any strong oxidant can be used in acidic environment.

H2O2, HNO3, Br2, Cl2, KMnO4, etc. You can choose at will, and the concentration is also optional.

In acidic environment, no oxidant can oxidize Co2+ into Co3+, and all oxidants with strong oxidation (such as F2, etc.). ) will react with water first.

It is troublesome in alkaline environment, so sodium tetrasulfate, a very weak oxidant, can be considered. But I don't think you mean alkaline environment.