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International standard size converter Transforms a cartridge pen into a fountain pen.

Dokumentus is the world’s first fountain pen ink conforming to the resistance requirements of DIN ISO 12757-2. It has been tested by the „Papiertechnische Stiftung Heidenau“ (Paper Technology Foundation in Heidenau), an independent standards body which has certified that this ink can be used by registrars for official documents. 50ml