Patina...a related question

[southtexas]

Didn't want to hijack Kevin's thread, but something jedly said caught my eye.

As I understand it, a lack of exposure to UV makes tritium darken at a more rapid pace. Is that correct?

Let's say a watch is 40 years old. It spent its first 10 years traveling, and living life. Then it gets put away in a safe for the next 30 years.

Over its life, it develops a nice even yellowish creamy patina on hands and markers.

Suddenly, it's brought out of the safe and into regular daylight and daily use again.

Generally speaking, will this cause the patina to:

lighten?

Darken?

Get loose and fall off?

Or--The effect will be unknown since they all react differently and there are too many variables?

Inquiring minds want to know........