Antique Books-How do I mend the separated spines?

Question

The books are from Great-Great Grandfather and they are dated from the 1700s..they have become separated. Is there a special tape or glue I should use?

any info. welcome :)

Answer 1

super glue

Answer 2

If they are worth a lot of money, it would preserve the value to have a restoration expert do it for you.  If they are just of sentimental value, use an archival, acid free, non-yellowing bookbinders glue so as not to damage the books.