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Like the Rolex Day-Date, the Stella dial features the date and the day, spelled in full, but unlike the standard edition Day-Date which traditionally features dial colors in black, gold, or silver, the Stella features dial colors in red, orange, oxblood, blue, green, turquoise, peach, salmon, pink, yellow, or purple. [10] [11] [12] [13]
Indiglo is a product feature on watches marketed by Timex, incorporating an electroluminescent panel as a backlight for even illumination of the watch dial. The brand is owned by Indiglo Corporation, which is in turn solely owned by Timex, and the name derives from the word indigo , as the original watches featuring the technology emitted a ...
The Radium Girls were female factory workers who contracted radiation poisoning from painting radium dials – watch dials and hands with self-luminous paint. The incidents occurred at three factories in the United States: one in Orange, New Jersey , beginning around 1917; one in Ottawa, Illinois , beginning in the early 1920s; and one in ...
The company did not stop the hand painting of dials until 1947. [3] The company struggled after World War I: the loss of military contracts sharply reduced demand for luminescent paint and dials, and in 1922, high-grade ore was discovered in Katanga, driving all U.S. suppliers out of business except U.S. Radium and the Standard Chemical Company ...
A "permanent" illumination watch dial Tritium-illuminated handgun night sights on an FN Five-seven. These light sources are most often seen as "permanent" illumination for the hands of wristwatches intended for diving, nighttime, or combat use. They are also used in glowing novelty keychains and in self-illuminated exit signs.
November 1917 ad for an Ingersoll "Radiolite" watch, one of the first watches mass marketed in the USA featuring a radium-illuminated dial. Radium was discovered by Marie and Pierre Curie in 1898 [1] and was soon combined with paint to make luminescent paint, which was applied to clocks, airplane instruments, and the like, to be able to read them in the dark.
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In addition to alpha and beta particles, radium emits penetrating gamma rays, which can pass through the metal and glass of a watch dial, and skin. A typical older radium wristwatch dial has a radioactivity of 3–10 kBq and could expose its wearer to an annual dose of 24 millisieverts if worn continuously. [ 2 ]