Old milky Gateron Switches Yellowing?

So I’ve been doing some switch modding today and I took out these milky Gateron blues. They are around 4 years old and I noticed that the bottoms have yellowed but the tops have not.

Has anyone noticed this phenomenon? I wonder if this also applies to newer milky Gateron Switches as well. These are both for previously soldered and never-been-soldered switches.

Functionally this makes no difference at all for switches. But I guess it is one potential way to guess the “vintage-ness” Gateron switches :joy:

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