Aluminum Pot Color Change with Water
Date: August 2008
What specifically causes an aluminum pot to turn black when
boiling water? Is the water safe to drink?
Without a chemical analysis, I am not sure one can reliably predict what
the black substance is. The reason is that while we refer to "aluminum" pots
and pans the metal is alloyed with other metals for a particular
application. There are dozens of aluminum alloys used in various commercial
applications. One seldom sees "pure" aluminum except in chemical reagents.
If toxicity were a major problem, I suspect its toxicity would have been
identified by now, but I do not have any data on that point.
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Update: June 2012