Teddy Baldassarre
Watch Lume 101: The Complete History and Primer on Reading Time in the
Luminous material on watch dials - referred to in shorthand as “lume” by both industry insiders and avid enthusiasts - is an element taken for granted nowadays. It can be said without hyperbole that a watch dial without lume is a stylistic outlier in this modern era, but this wasn’t always the case. Discerning the time in the dark presented a major problem for watchmakers in the early days before the widespread use of electricity in homes, and at first the only solution that could be offered was an audible rather than visual one: watches that chimed the time on demand, like minute repeaters and sonneries. Only a handful of wealthy individuals could afford these highly complicated timepieces, however, so a more widely accessible technology was needed as wristwatches spread to the general populace. Around the dawn of the 20th Century, watchmakers turned their attention to making watch dials that could be read in the dark, paving the way for the luminous materials that are still used commonly today. The road to perfecting the technology, however, would not be easy, and at times would even be dangerous. Radium The first material applied to watch dials for nighttime luminescence was a paint made from radium with zinc sulfide, which, thanks to radium’s half-life of 1,600 years, offered a long-lasting glow during that period before dimming - the catch being that radium, as its name implies, is radioactive. One of its earliest uses can be traced to a pioneer of devel...
