One hundred twenty years ago, the Curies discovered radium.
Promoting this discovery to be used in the watch industry should be a battle.
Military pocket watches with black dials and large hour markers were common in the early 20th century. It is often used as a coating for time scales and hands. It is a mixture of radium and zinc sulfide (Zinc sulfide). This is the earliest luminous material on watches. Fake watches for sale.
Although radium’s radioactivity was proven harmful as early as the 1920s, it remained the luminous material of choice for a long time.
The luminous materials of early Submariners were no exception. The picture below shows the first-generation Submariner Ref. 6204. Its bright material has become mottled, and its honeycomb surface has also suffered erosion. “A face full of traces of time.”
The safety of radium-luminous materials is always a significant hidden danger. Rolex finally gave up in 1963 and switched to tritium. Although tritium is also a radioactive element, its radioactivity is weak, and its half-life is short. Cheap fake Rolex.
The picture below shows the Submariner Ref.5513 from 1966, made of tritium luminous material. Swiss – T＜25 are marked under the 6 o’clock hour mark. T＜25 means that the tritium radiation emission in brilliant materials is less than 25 millicuries.
The half-life of tritium is only 12 years, so its luminous life will be exhausted after a few decades. But what is interesting is that the hour markers have gradually turned yellow over the years. If a gold frame does not surround them, they are trendy today.
Rolex is famous for its durability, but the lifespan of tritium is shorter than that of the watch itself, and Rolex is always looking for better alternative materials.
In 1998, Rolex began to use Luminova luminous material supplied by Nemoto and Co., which was later upgraded to Super Luminova. Its main component is strontium aluminate salt (SrAl2O4). It is a photoluminescent material that can emit light for several hours after exposure to light for a few minutes and has a longer lifespan than tritium.
The previous generation of Submariners used this type of luminous material.
The current new Submariner’s luminous coating is Chromalight.
This new material replaced Super Luminova in 2008 and first appeared on the Deepsea submersible model. Unlike Luminova’s green glow, Chromalight appears blue in the dark and is more durable.
At this point, we can appreciate this charming touch of blue whenever we are in a dark place.
Case Color: Silver-tone
Case Size: 40mm
Band Color: Silver-tone
Case Thickness: 15mm
Band Length: 18cm