Sodium reacting to ambient air.
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Previously:
https://www.homemadetools.net/forum/...275#post192203
https://www.homemadetools.net/forum/...347#post196434
https://www.homemadetools.net/forum/...672#post190053
https://www.homemadetools.net/forum/...293#post188541
https://www.homemadetools.net/forum/...328#post188727
