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Old March 25, 2013, 05:43 PM   #20
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Join Date: September 8, 2007
Location: Mississippi
Posts: 12,244
From your Wiki link.

Because corned black powder grains made with saltpeter are less affected by moisture in the air, they can be stored unsealed without degradation by humidity.

the residue from burnt black powder is hygroscopic and with the addition of moisture absorbed from the air, this residue forms a caustic substance.
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