Could be various reasons why certain cards have color differences:
1) Printing press had less ink during parts of the print run.
2) Color pass was forgotten entirely and only certain colors were applied.
3) Lighter cards may have been soaked or sun/UV faded or treated with chemicals.
4) Card could be fake.
5) Printed on a different sheet (second series printing)
You've really got to take it on a case by case basis. A lot of the 1952 Topps have different background colors.
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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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