The last Ban Mi fluorescent ink is Yellow. It is very bright yellow, but it’s also illegible.
The packaging on these inks was not clear if they are safe for fountain pens, but I have used them in Jinhao 82 pens and had no trouble using the ink or cleaning it after. I have not tested its water-resistance, but it does look similar to pigment inks in other ways, so take care with their use.
Scans
My scanner, like many others, does not do well with fluorescent colors, so these are mostly for consistency and to show how badly it handles them.
It came out practically invisible. There is a faint hint of yellow on the paper, but it’s barely there.
Photos
The photos are accurate, it is almost impossible to read.
It trends a bit green under UV, especially on MD, but even with a mix of UV it’s easy to read.
Microscope
Under magnification it’s very pale. It’s also very shiny, I’ve seen that before with pigment inks where it has a gloss over everything.
It gets darker around the edges, but there isn’t any sheen other than the gloss that covers everything.
Microscope UV
With UV under magnification it’s about the same as the photos. MD has the best contrast by far, but it’s green and not yellow.
Chromatography
As with the swatches, the scan of the chromatography strip doesn’t show hardly anything.
A photo of the strip shows mostly a very faint yellow line and a little bit spread from there. Also similar to behaviors I’ve seen from pigment inks.
Under UV, the yellow area glows very brightly, and there is a faint blue halo way beyond that area.
Verdict
It’s extremely difficult to read in visible light, but like the others, it would probably work OK as a highlighter/accent ink. Under UV, it’s actually great on all of the papers, even though it’s green.
I mentioned earlier I haven’t had any trouble with it in a fountain pen, but treat it like a pigment ink to be safe.
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