For more information, you can check whether the ink complies with DIN ISO 12757-2 and/or read up on "Dokumentenechtheit" [1]
[1] https://de.wikipedia.org/wiki/Dokumentenechtheit (It hasn't been translated to other languages yet.)
For more information, you can check whether the ink complies with DIN ISO 12757-2 and/or read up on "Dokumentenechtheit" [1]
[1] https://de.wikipedia.org/wiki/Dokumentenechtheit (It hasn't been translated to other languages yet.)