The Octopus Fluids "Document Inks", however, are more resistant to UV rays and do not lose any of their radiant colour strength even after a long time. We have not added any dyes and have used only the finest pigments. This ensures that writers can present their work over the long term without worrying about the colours fading or becoming illegible.

Octopus Fluids Document Inks are waterproof, lightfast, smudge-resistant, non-erasable and resistant to ethanol, hydrochloric acid, ammonia, bleach and most other chemicals in accordance with the requirements of DIN ISO standard 12757-2.Please take care not to let the fountain pen dry out. As the inks are waterproof and permanent, the resistance will also show in the dried-up fountain pen. It will then take a great deal of effort to clean the fountain pen.