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I've seen inks listed as permanent, bulletproof, registrar's, and so on, but am unsure what exactly occurs over time with inks that are not so labelled. Do they just fade away? Do they eat at the pages if a lower pH? Over what time period should I expect such deterioration? I am handwriting notes for a research degree involving a large project, and just wondering if I should make special effort to ensure I do so using a 'permanent' ink? I currently use Lamy and Kaweco inks, but have three beautiful bottles of Iroshizuku on the way that I intend to use for this purpose. I am writing in a Leuchtturm1917 notebook. Given the context of my use, is this something I should realistically be worried about? I'd like my notes to remain usable for a couple decades or so I suppose, but whilst of course I don't want my notes to fade away it does seem overkill to purposefully seek an ink that guarantees a century of permanence! Whilst you are here and thinking about the topic, do you have any recommendations for inks in blue-black, dark teal, dark green, and generally stormy colours? Thank you!