As you’ve seen, fluorescent inks actually change a bit of invisible light into visible light (simply put), so they really are a bit brighter. That’s why the 80’s were so neon, after the pigments were available cheaply.
If you had a printer you don’t mind wrecking, you *could* have a go at gettting empty, clean cartiridges, and filling them with the guts of fluorescent markers. I mean the colours will be all over the shop, but it’ll pop more 🙂
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