More likely, your clock owes its luminescence to tritium, a weakly radioactive substance. Tritium is used on watch hands and numerals and in some ”back glow” watches.

Watch This Glow-in-the-Dark Resin Clock Come to Life! Posted: March 18, 2025 | Last updated: July 11, 2025. Welcome! In today's video, I'll show you how I created a unique clock using epoxy resin ...

The clock not only keeps time but also becomes a captivating decoration with its glow-in-the-dark numbers, adding a mesmerizing touch to any room. Watch and get inspired to create your own!

Westclox clocks, with their glow-in-the-dark faces, were once hand painted with radium, at the Radium Dial Co. and its successor, Luminous Processes, in Ottawa, Ill.

The warm, antique glow? Even better! Instructions are available if you want to take a stab at your own gorgeous meter clock —though I don’t think it’ll make seeing your 7 a.m. wakeup any ...