This is one of the topics I am intensely interested in: colour changes or intensity changes when comparing banknotes under UVA (365nm) or UVC (254nm).
UVA is what a shopkeeper or a home collector would routinely check notes with, as it is not so damaging if you happen to illuminate your own hand.
I use a Lumenshooter S5 light which is quite pricey, around 90 Pounds. But I get good pictures with a camera on a tripod. Have a look at this nice Fiji note, the 88 Cents.
To get UVC, you need to get a light that outputs at 254nm, but this is not a safe light to just shine around without care!
They use 254nm (UVC) lights as sterilizing bulbs in pond filters.
You can get a mains-powered UVC light but it will emit a pale blue visible light also. You need to filter that light out by using a piece of glass known as a UV bandpass filter. They are quite expensive, the glass is about £30 on eBay.
But, now you have the opportunity to see a big difference between fluorescence at UVA and UVC.
I have a thread on this with a lot of examples on Numista:
[Скрытый текст]
The Czech 1988 20 Korun is the earliest example I have in my collection, currently. Under UVC red blocks appear.
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