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Old January 26, 2013, 09:45 AM   #6
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Join Date: December 20, 2008
Location: Somewhere on the Southern shore of Lake Travis, TX
Posts: 2,253
The aluminum foil that surrounds the powder charge effectively forms a Faraday cage around the charge and actually protects it against static charge rather than causes static charge.

A lot of folks have a misconception about being in a metal building during a lightning storm, a metal building is exactly where you want to be during a lightning storm, you are inside a Faraday cage and protected.

Here's a Faraday cage video.
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