In my last video, making the experiment with acetic acid to remove rust from an old hammer, at the end of the treatment I've noticed kind of a patina on the hammer that easily came off by just rubbing with my fingers. It came off as a fine slush leaving a metallic shade on my glove.
Without thinking too much, on video I've said: it's gotta be iron powder.
Is it really?
A viewer posted a clever comment to the video, pointing out that the powder was not iron but carbon, since hammers are made out of high carbon steel.
He had a good point, so I decided to carry a little experiment showcased in this video.

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