From adult cereal boxes?
I really don’t mean to sound like this is an uncool thing. It’s a very cool thing. It just amazes me. This is one of the only things that I’ve heard of that’s worse than
a) running behind the DDT truck to cool off
b) “Showering” in 1,1,2-TCA over the dirt - to get grease off yourself.
Both of which were shockingly common in 1947. Smoking is something we recognize from that era as shockingly unsafe - these rings kinda take the cake. I’m sending the info on this ring to a toxicology prof I know, as yet another example of
“we really really must not have known better back then”.