I'm not an expert on metals but I did do 3 years of metalwork in high school. It feels like steel to me.
I could get a beaker with measurements on the side, fill it with water and then put the barrel in to raise the water level. That will give me the volume of the barrel.
Then I can weigh it, and divide the weight by the volume to give me the density. Alluminium should come out at about 2.7. Steel is three times denser at 8.0.
I've never anodised anything but I want everything matt black.
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