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PostPosted: Thu Nov 16, 2017 4:16 pm 

Joined: Tue Feb 03, 2015 6:57 pm
Posts: 4306
Location: Low DOS
It’s usually stamped as such. Beyond that it’s practice.

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PostPosted: Sun Jul 08, 2018 7:17 am 

Joined: Tue Jun 19, 2018 4:52 pm
Posts: 9
flyfish2k wrote:
how do you test for Magnesium?

Don't try the old "flame test" for magnesium. If you heat it with the propane torch, it will ignite and burn with a brilliant blue-white flame until nothing is left but a powdery ash. I learned this when trying to cut out rusty bolts from junk lawnmower frames years ago


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PostPosted: Sun Jul 08, 2018 4:11 pm 

Joined: Tue Feb 03, 2015 6:57 pm
Posts: 4306
Location: Low DOS
David: absolutely correct. Magnesium is a very volatile metal.
Magnesium flame testing... you’re not actually burning it but igniting it.
Magnesium is used in Roman candles, aerial fireworks, and MOST fire based fuses. Gives of beautiful sparks.

So how do you tell magnesium from manganese? Well I guess the fastest way is to make a pile and set it on fire.
Anything left over that is metal is manganese. The powder is un-scrapable magnesium oxide.
Makes great fertiliser for conifers though! ;)

Bottom line is don’t. Just a bad idea. And if you must, NEVER throw water on the blase. You get instantaneous oxidation and hydrogen release creating a big explosion, 10,000•+ flame, a blinding (as in never see again) flash, and that’s assuming you survive the heat blast.

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