It’s odd how dispassionate this article is considering it’s about Germany and WWII is in full swing although it’s four months before the U.S. enters. Once we joined the war you’d expect to read about how the evil Huns are painting their death gauges using glow-in-the-dark unicorn tears that are only produced by eating French babies.

Invisible Rays in Blackout Plant Make Dials Glow

GHOST LIGHTS shine in German power plants during air raids, but there is no stray gleam from the plant windows. To accomplish this, vital gauges, levers, switches, control wheels, stairs, ladders, and walkways within the plants are painted with chemicals which glow only when illuminated with the invisible rays from special lamps.