I use a black light on every card, every time no matter the cost and I only collect pre ww1. It helps pick up all flaws and alterations, it can help ID when a card has been removed from a book and other minor things.
I have a bar mounted above my desk under the shelf for the TV and a small one that goes to shows with me on my backpack. I tell the dealer I want to view it under my light, empty my bag and turn the bag so we both can see and place the card inside to make it dark and turn on the light. It will show you all sorts of things IMO.
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