SCRIBTOL
The most resistant ink in our collection is Scribtol.
It provides good coverage and is light-fast as well as being non-fade, so this ink can be categorized as document-proof.
This ink should not be used inside fountain pens due to the mentioned reasons (color particles, i.e., soot). Instead, it should be used with drawing nibs only, i.e., those that don’t have feeding systems and are only dipped into the ink.