Question 2·Multiple choice
In 1949 Panerai registered 'Luminor' as the name of a new self-luminous substance, replacing its earlier Radiomir. What was Luminor based on?
- A.Radium bromide
- B.TritiumCorrect answer
- C.Promethium-147
- D.Strontium aluminate
The story behind it
Radiomir, from 1916, was a radium-based powder; Luminor swapped radium for tritium, a hydrogen isotope with much lower radioactivity. The name began as a lume, not a watch, which is why 'Radiomir' and 'Luminor' now label case families rather than paints.