I think it would be very nice to talk with a chemist. In my opinion, the quality of the materials that are used, the fine proportion of them, makes the bezel and the dial change the color or retain the initial color. I think Omega made a mistake when they mixt the quantities for some lots. And for this reasons they were a little blue.
Of course, it is important where it is used, the condition and the way is stored.
I think you are exactly correct.
What you say here has long been espoused by Rolex collectors.
Here's the definition of Black:
In the visible spectrum, black is the absorption of all colors. Black can be defined as the visual impression experienced when no visible light reaches the eye. Pigments or dyes that absorb light rather than reflect it back to the eye "look black"
Black is made using Equal parts of the Primary colors Blue, Red, and Yellow. It can also be made using "hues" (mixtures of primary colors)
Primary colors are colors are one color only, that can't be made with other colors.
Why does ultraviolet light cause color to fade?
Because of photodegradation.
It is all about the chemical makeup of an object. The technical term for color fading is photodegradation. There are light absorbing color bodies called chromophores that are present in dyes. The color(s) we see are based upon these chemical bonds and the amount of light that is absorbed in a particular wavelength.
Ultraviolet rays can break down the chemical bonds and thus fade the color(s) in an object - it is a bleaching effect. Some objects may be more prone to fading, such as dyed textiles and watercolors. Other objects may reflect the light more, which makes them less prone to fade.
Red paint is noticeably the fastest colour to degrade, while Blue is the slowest
Red degrades faster because it absorbs higher energy (shorter wavelength) light.
UV coatings are added to outdoor signs to extend the life of the dyes.(Watch dials and bezels too I've read.)
Some theories: ( No, I'm not a chemist, lol)
Dials: Improper or lack of color protective UV coatings or components in the manufacturing Process.
Brown can be made from primary colors mixed disproportionately.
Bezels: Chemical degradation of the UV coating(or as a component of the dye)(salt, chlorine, oxidation) causes the Red
dye to degrade faster than the yellow and blue. Since blue is the slowest to degrade,
you get a blue hued bezel under the right conditions.
Why do bezels fade to gray? Maybe a proper color pigment and uv protective component
mixture fades proportionately(instead of the red faster, blue slowest)
