Diamine Archival Registrar's Ink

The official ink used to record births, deaths, and marriages in the U.K., formulated to be suitable for use in fountain pens. Diamine Registrar’s Ink is traditional iron gall ink, which writes blue and then oxidizes to a dark blue-black (mostly black) color.

100ml bottle.

Fully waterproof, per Diamine. Made in the U.K.