Closeup on samples of the metallic element Potassium (K). The samples need to stay covered in oil to prevent corrosion, even then a thin blueish layer of oxide has built on the surface..

Closeup on samples of the metallic element Potassium (K). The samples need to stay covered in oil to prevent corrosion, even then a thin blueish layer of oxide has built on the surface.. - 140033685

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