I concur with Daniel Couton's opinion. Likely oxidation of a metal. Water analysis in this case is necessary. https://doi.org/10.1016/j.ica.2006.03.035

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I concur with Daniel Couton's opinion. Likely oxidation of a metal. Water analysis in this case is necessary. https://doi.org/10.1016/j.ica.2006.03.035

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