Source of Patina- sun or darkness

[Wilddyan]

Hello everyone,

Would appreciate some help- my 68' gmt 1675 still has very little patina- my basic grasp of chemistry made me think this was due to a lack of sun exposure and therefore over time as I wore it in the sun patina on the dial would slowly yellow the dials.

However having done some research it seems that there is a case that uv light actually lightens the dial and keeps it white. I would love to get some feedback- will of course continue to wear the watch, but when am not should it been in pitch black to encourage patina?

Would appreciate any feedback...