My bottles of Tramol Turritopsis Nutricula (UV Invisible Ink) arrived, so I immediately inked my Penbbs 494 with it and the results are magical, to put it mildly.
This is on Tomoe River S Kanso paper illuminated by an Emisar D4v2 UV mule flashlight with a ZWB2 filter -- the filter is important, it blocks everything except UV so you don't get a purple-ish cast on the paper. The paper plays a part, too as it is not UV reactive.
Here is the same text with the UV light off and then on so you can see it's invisible without the UV light.
It's great for hidden secret messages or things you want to be very bright under UV light.
More here: https:// imgur.com/a/tramol-turritopsis -nutricula-uv-invisible-ink-qSu9oXR
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