100ml plastic bottle of Diamine Registrar's Blue Black Ink. Archival Iron Gall and water resistant permanent ink for document signing. Diamine Registrar's Blue Black fountain pen ink is a deep blue-black that leans towards Black. Having trouble deciding between colors? Use our Ink Comparison Tool to quickly and easily view different colors side by side.

Volume - 100ml Bottle Material - Glass Color Group - Blue-Black Special Properties - Iron Gall, Water Resistant