Octopus Fluids - Document Ink, Blue (30mL Bottle)

This is Octopus Fluids' Blue document ink: a DIN ISO-12757-2 certified document ink that has withstood tortures (water, UV exposure, bleach, other common chemicals used for forgery) that would make other inks blush. Or fade.

If you need an ink that will outlast the paper it's written on, you want a Document ink like this one.