Is this mold or a stain?

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I just received a used book. The last page before the back cover had some black spotting.  I used a white polymer eraser and most of it came off. A small amount is left.

Does this look like mold? (See close-up photo)

If so, what can be done about it?

 

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    Posted by (Questions: 4, Answers: 2)
    Asked on August 13, 2021 6:09 am
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    Here is a picture that is a little clearer.

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      Posted by (Questions: 4, Answers: 2)
      Answered on August 13, 2021 8:55 am
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        If you were able to wipe off some of it, it is likely mold. You can wipe 99% isopropyl alcohol on it and let it sit in a sunbeam for an hour or two. That is as much as you can do. It is still likely that the mold will not be completely killed. It goes dormant and will reappear under "ideal" circumstances with enough humidity and heat. Keep it in a controlled environment though, and it will be fine. If you are super concerned, keep it separate from your other books. 

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        Answered on August 16, 2021 12:17 pm