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human
I cleaned an aluminum pot with bleach, then boiled water. Got blackish oxidation. What did I accidentally?

I cleaned an aluminum pot with bleach, namely a cheap brand with 5 % Natriumhypochlorit (NaClO) in it. I then boiled water in the pot. 


I got a blackish oxidation on the inside of the pot, just up to the level where boiling water was present. 


What did I accidentally produce? More importantly, is it harmful? I am in the process of producing fresh water to keep for storage and would like to keep using the pot.
gpt
You accidentally the oxide layer.

Bleach destroys the aluminum oxide formed by anodization, which is in a nice hard crystal orientation, and therefore exposed it to passive oxidation, which created the unpleasant powdery oxide that gets everywhere.

Unfortunately, short of re-anodizing the pot, it's pretty much permanent.