Optical brighteners began to be added to paper to make it brighter, whiter, after World War II. I don't think it's the ink on your 1962 Topps that is fluorescing, it is the paper itself.
I'm glad to hear that you're shining your black light on cards. I wish more folks would use those.
First time I was glad I used one was with a Remar card for a Pacific Coast League set, from 1946 or 1947, I think. I got it in an eBay auction. It blasted bright blue when the light hit it, the dozen or so other Remar cards I had didn't fluoresce at all. I messaged the seller, told him that it fluoresced and it shouldn't, it was not genuine. I asked him to refund my payment and double shipping fees so I could be refunded those and could also send it back. He refunded payment and shipping and said to not bother sending it back. From the words he chose I inferred that he knew it was copied or printed on cardstock and not genuine.
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