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Would pure compounds like thymol, carvacrol, and cinnamaldehyde work as preservatives of fountain pen ink? I'm specifically interested in three properties -

  1. Prevention of growth (mostly fungal) in the bottle of water-based ink.
  2. Not be caustic to fountain pen materials - metals, plastics, and rubber.
  3. Does not cause an allergy when handling or if some ink ends up on the user's skin.

Would the compounds I mentioned be suitable for this purpose? Thank you very much in advance.

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    $\begingroup$ Natural also means more organisms may already have a way to deal with it. $\endgroup$
    – Poutnik
    Sep 5, 2021 at 14:47
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    $\begingroup$ Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. $\endgroup$
    – Community Bot
    Sep 5, 2021 at 17:08
  • $\begingroup$ That I would be willing to accept, but what about the caustic or noxious nature of the chemicals to humans and pens? $\endgroup$
    – Inkman
    Sep 5, 2021 at 17:30
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    $\begingroup$ The most noxious chemicals are natural ones. The boundary is not synthetic=bad and natural=good. $\endgroup$
    – Poutnik
    Sep 5, 2021 at 20:29
  • $\begingroup$ Are thymol, carvacrol and cinnamaldehyde corrosive to metals/plastics/rubber? $\endgroup$
    – Inkman
    Sep 6, 2021 at 17:29

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