I think the card was in a scrapbook that had paper sheets with a significant lignin content. Think wood pulp paper with a bit of acidity. With the passage of time the paper turns brown. A Sporting Life newspaper from 1910 looks fine today, generally. A 1930 Sporting News is most likely brown and a bit brittle or fragile.
Many T206s were once in scrapbooks. And the cards were soaked off of the pages at some point in time. This is especially true of T206s with nice corners. That's not a popular, embraced concept by most collectors of graded cards, but I'm satisfied it's true, nonetheless.
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