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While I don't use metallic sodium often, I believe if you take it into the air it will form a white film over the surface and that agrees with my hazy memory of it.
In dry air, you'll get a sodium monoxide film, which is white.
In humid air, you may get sodium hydroxide...or a bit of both. Sodium hydroxide is also white.
So fair to say, you'll get a white surface. Note that with solid sodium, only the very outer layer is this colour. The inner sides will remain intact as elemental sodium.
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