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A red copper compound and Cu(III)
In this video a red copper complex is prepared, which is interesting because copper doesn't tend to make such colors. Normally copper salts are blue or green, maybe purple sometimes but not red... Aside from that a copper III compound can be prepared from that red complex which is quite rare.
The paper on biuret complexes: https://doi.org/10.1039/J19670000137
The copper and Nickel (III) paper: https://doi.org/10.1021/ic50100a021
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