Read it again; sun fading/UV light affects yellow the most. The other areas you point out don't have yellow ink in them, however the portraits do, and those are also faded to remove the yellow.
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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