120 years ago, the Curies discovered Radium. However, it was adopted in watches during the first World War. In the early 20th century, Radium was usually used to coated the hands and hour markers. It is the earliest luminescent material. Although the radioactivity of Radium was proved to be harmful to humans in 1920s, it still was the only luminescent material in watchmaking industry.
The first generation of Rolex Submariner fake watch with steel case adopted Radium as its luminescent material too.
Rolex gave up the Radium due to the security problem in 1963. It changed to Tritium. The half-life of cockroaches is only 12 years, so after decades, its luminous life is running low. But what’s interesting is that the hour markers are gradually yellowing after years of baptism. If it is not surrounded by gold, it is highly sought after today.
- Super LumiNova
Rolex kept finding the better representative material always. In 1998, it adopted the Super LumiNova, which is Photoluminescent, offering longer lifetime than Tritium. The last generation of Rolex Submariner was used the Super LumiNova. See the picture please, the popular copy Rolex exudes charming green light at dark night.
The current Submariner has used the Chromalight, which took place of Super-LumiNova in 2008. It was firstly used on Deepsea. Chromalight exudes blue light instead of the green light of Luminova.