Yellow tint on capacitive keys?

[TechyMexican]

I've been watching the reviews and have noticed that in some pictures there is a yellow tint on the keys. I know i'm being picky but I hated that on my lumia 900 and 920, my 1020 was perfectly white and so was my 8X. any idea if this is true?

 

[Alex Dean]

I think it's a batch problem; my first 920 had that issue and wasn't built properly at all (the casing creaked when you applied pressure to it, which was a common issue with early devices), but my second 920 and now my 1020 have white buttons and are built impeccably. So I feel it is just early teething problems with the manufacturing process.