Invisible wrote:

> Not magnesium, no. (Not at any appreciable rate, at least.) Try it with, 
> say, sodium and you've have a Big Problem. Magnesium is far too 
> unreactive for it to be a problem.

But when the metal is at the combustion point it would react with the 
water, right?

Yes, right ... http://en.wikipedia.org/wiki/Magnesium#Precautions

The only way to douse the fire is to smother it. Water will simply piss 
it off.

Sodium reacts if you so much as look at it wrong...

-- 
~Mike

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