![]() Note that old radium paint no longer glows in the dark because the radiation burns out the fluorescent material over a short time, about 5 years, but the radium has a radioactive half life of about 1,600 years and therefore remains very nearly as radioactive as when the paint was new. These are called radioluminescent paints because their luminosity comes from radioactivity stimulating a fluorescent material to emit light. There are broadly two types of luminous paint that a watch collector might encounter, modern luminous substances that are quite safe, or earlier paints based on radioactive materials such as radium that need to be treated with caution. Ever since military, and many civilian watches, have had luminous dials. This is discussed in more detail on my page about Trench Watches. ![]() Trench Watch with Radium Luminous Dial: Click to enlargeĭuring World War One it was quickly realised that a watch with luminous hands and numbers was essential for an officer in the trenches, it allowed the time to be checked in low light or in the dark without using a light that could have attracted a shot from an enemy sniper. Bocks and Rams: IWC and Stauffer Trademarks.New product: Leather and Sterling Alberts.Savonnette and Lépine Watches and Cases.Converted Wristwatches - Transitional? No.Bears Galore! Three Bears and 0♹35 Silver.Borgel 2: Taubert & Fils and Taubert Frères.Borgel 1: François Borgel and Louisa Borgel.English Watchmaking Companies Main page.Straps for Vintage Fixed Wire Lug Trench Watches or Officer's Wristwatches
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