Couldn’t find anything specific online, but if you search closely it may be located on the physical copies of each newspaper. Here’s what I found from my research, most newspapers are made on paper called “Newsprint” and is the cheap, low-end, and acidified version because it is well known how short the life of a newspaper is. When yellow coloration occurs to old newspaper, it is simply the acid oxidizing from sun exposure. Most companies use pine pulp and scraps of trees so that new trees are not killed for such a temporary news medium.
Let me know if this wasn’t what you were looking for, thanks!
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