I’m fond of the possible Chromera connection others are playing with, because I find the implicit dynamic of right-brain-Chromera and left-brain-30b, and the implications of what happens when the two mix into 30i, really interesting.
However, I find the existing submissions hinting at this connection too on-the-nose. IMO, the best way to convey that sort connection is to hint at it subtextually. Make it more of a fun easter egg attentive players could piece together on their own, rather than some weird lore we splash in their face.
Hence, “Vial of Dye”.
Dye is distinct from ink, in that you’d never think to call something you’d write in a book with “dye”. It’s a generic term for any coloring substance; its connotations are near-exclusively artistic, and may refer to various powders, paints, or fluids that aren’t even possible to write in a book with.
However, dye and ink are similar enough, and the name “vial of dye” non-specific enough, that many wouldn’t bat an eye, or question why it has such an effect on 30. A perfect way to hide hidden meanings, as it’s inoffensive to those who don’t care.
Additionally, “dye” ties directly into 30i gaining Tinted Lens. It is the substance that tints 30i’s lenses, be it literally or metaphorically.
Finally, “vial” and “dye” sound like “vile” and “die”, fitting the more general supernatural Poison-type flavor.