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Welcome to The Death Envelope (.com)

The Original Presentation at Defcon 16:

Waterproof Fountain Pen Inks at JetPens: https://www.jetpens.com/Waterproof-Inks/ct/3253

The Check Guardian Blue Refill from Fisher Space Pens: https://www.fisherspacepenstore.com/products/check-guardian-refill-blue-medium?variant=13936958144630

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