Yellowing Borders 1972-1974

[danx]

Like I said, I am not seeing on my cards that are stored properly - just noticed that more and more cards for sale from 72-74 have aged borders.

Here are 4 examples of cards currently listed by the same seller - this is the first four I pulled: Hank and Rose have yellowed borders and the other two are whiter. Seeing the same from all sellers...

[toppcat]

Some thoughts....

1. Some plastic holders that yellow do not seem to degrade cards stored within them.
   
2. Yellowed borders could be from a home where people smoked.
   
3. Topps often used two grades of card stock with their sets. One seems to stay white no matter what and the other gets dingier with time.

Not sure that's what's happening with your examples i.r.o items 2 and 3 but they could be contributing causes.

[steve B]

The glosscoat Topps used could yellow. Some 77s were yellowed by about 1980-81.

I'm not sure if it's a sign of multiple printers being used, or different glosscoat at the same plant.