Reply To: c.1915 "Glow-in-the-Dark" Postcard-Hazard?


I was able to find snippets of some french articles that suggest that Zinc sulfide may have been used.

I think RAD stands for Radiana, which was either a company or the trade name of the paint/process. I believe it to be different from the Radiana trademark used in the US for “radium gowns” described here

and here

see also this french article, illustrated with photo postcards that also glow