Rolex

The blue part of the bezel turns red when a uv light is applied. Look betwen 2-4-6 red. ...  

I’m going to try that 🤔 Thanks Bill.

. I believe that the bezel starts as all red and then the top part undergoes a treatment to make it blue/violet. So it makes sense

😍

on this ...

I do this with mine as well and it always gets a good reaction. I wonder how the top half will age, if at all, as a result of this process?