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The Rohrer & Klingner Dokumentus Inks are the world's first fountain pen ink conforming to the resistance requirements of DIN ISO 12757-2 (the standard that determines archival quality). Rohrer and Klingner Dokumentus inks have been certified for use by registrars on official documents, they’re ph-neutral, permanent and archival.
Some criteria of this certification require color to remain readable after a defined dose of sunlight and under the influence of water the ink may only extend so far that the text line remain visible. ISO 12757-2 requires legibility and the ability to be stored for long periods of time. These inks should show resistance to water, light, ethanol, hydrochloric acid, ammonia, and bleach.
It has been tested by the Papiertechnische Stiftung Heidenau (Paper Technology Foundation in Heidenau), an independent standards body, which has certified this ink can be used by registrars for official documents.
New technology and high-quality raw materials used to formulate this new pH-adjusted ink guarantees permanent and archival writing. Comfort of writing with a fountain pen was the main focus of this new product development.
Do make sure to cap on your fountain pen after use to prevent blockage in the nib. Beyond this, no special care is needed!