1939 “The Shadow” Secret Society Glow in the Dark Button

I am not too knowledgeable about the history of “glow in the dark” technology. I guess I kind of assumed it was a post atomic age tech, but this “The Shadow” buttons from Hake’s shows the ability to make things light up in the dark was alive and well in the late 1930s (courtesy of your Blue Coal dealer).

What is amazing is that after 70+ years, this premium still glows in the dark.