by Ellen Kuhfeld » Tue Dec 29, 2020 11:02 am
Paper after 1925.
(Aside, and more than three words - and not all of them little. Paper made after about 1850 was horribly acid, because of the alum used, and it didn't change until the early part of the twentieth century. Books of the alum age do not age well. In sooth, they fall apart. I worked in a library of historical books, and the books from the 18th century were in far better condition. Newsprint and wrapping paper excepted, of course, though even Colonial broadsides are often in better shape than 1900 newspapers.)