The Octopus Fluids Document Inks are indelible writing inks, which were specially developed for professional use in the office, in particular for signing official documents and certificates. In accordance with the requirements of DIN ISO standard 12757-2, Octopus Fluids document inks are waterproof, lightfast, wipe-resistant, cannot be erased and are resistant to ethanol, hydrochloric acid, ammonia, bleach and most other chemicals. The independent institute PTS - Papiertechnische Stiftung Heidenau has tested all 9 colors for the above properties and certified their compliance in accordance with DIN ISO 12757-2. The finest pigments are used for coloring. As a result, you achieve a strong typeface. The inks are vegan and offer a wide selection of 9 different colors to add a creative touch to your daily writing routine.