The newsprint on the opposing page is probably the culprit, maybe some dampness too. The book itself looks like a wallpaer sample book.
I like seeing these things kept together, it sort of gives a peek at the person who put it together. Plus there's usually no way of cutting it without destroying something that's on the other side of the page.
The simplest solution is to buy a pack of acid free tissue paper and use it as interleaving between pages.
Steve B
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