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Will mixing these two together cause a reaction of any sort? If so, is it safe and is there an order in which one should be added to the other?

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Potassium alum is $\ce{KAl(SO4)2*12H2O}$, the compound that you use to stop bleeding after a bad shave.

I'd say that it won't react, but don't put your health in the hands of strangers on the net.

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If you are not sure and you have to do the reaction, try it with small sample of $\ce{Mg}$ such as one flake. $\ce{Mg}$ flakes should react in water and will react with potassium alum.

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Finely divided magnesium in water corrodes, liberating hydrogen. "magnesium oil?" That is magnesium chloride in water. It is New Age hype.

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