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3D3DBoron carbide engine sabotage can.
Boron carbide is very hard and can thus be used for grinding. In this case, the idea is to pour some of the dark, oily liquid in this can into the oil supply of an engine in order to cause it to grind itself to a halt. I assume the cylinders either become scored to the point that they can't hold compression, or maybe become jammed by the grit. In any case, this is something you would do only under dire circumstances, for example in war (as this can was intended for), or to an ex-girlfriend or something. Not that I'm recommending that, you could get in big trouble.
Source: eBay seller 4slghmr87
Contributor: Theodore Gray
Acquired: 8 December, 2007
Text Updated: 8 December, 2007
Price: $66
Size: 3"
Purity: <20%