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This is interesting information says the "stats' we should add them so it creates a larger niche market to break 💔 up and create more "collectibility" of these and the Bowman cards. 

When I go to the show I'm always on the prowl to buy in bulk so called"junk wax"

So one night I was bored and decided to play with my black light. There are actually a few different sets besides the 91 Topps, that have glow backs. As a matter of fact the common 91 Bowman is glow back, with the rarer of the variation being non-glow backs. At least that is how it appeared when I was messing around. Some of the early 90s Stadium Club have a glow and none glow back variation. The most surprising glow backs I found were 1994 Upper Deck. Granted I said all of that to add my 2 cents to the whole glow back variation issue. There are other sets that have the same ink variation as well. No matter how you slice it though, none of them are rare. 

Found this opinion of 6-variations three or four years ago on a blog I follow. Interesting story on the 89 Donruss baseball cards and one man's quest to acquire each variation of the Ken Griffey Jr. RC. Nothing about glow backs though? I've been kind of wary to share this here, but since the can of worms is already open ...

https://dfarq.homeip.net/1989-donruss-variations/   

Reading this

I don't live in a clean room, I don't even want to imagine what would happen if I had a black light at home.