Magnesium powder is elemental magnesium ground down to a fine
powder.
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you get magnesium oxide + iron
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The magnesium powder is used as a source of illumination for the
photo. Just for the older cameras, the ones we have today use
lights not the magnesium powder.
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For example the melting of this powder.
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Yes it is. And you have not asked a question yet. The white
powder is magnesium oxide.