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

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

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