Welcome to The Death Envelope (.com)
The Original Presentation at Defcon 16:
Links to Resources
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