Brown speckles or splotches that are the result of mold growth, typically catalyzed by metallic ions in paper. Collectors tend to avoid books that show foxing unless no unfoxed copies can be found.
a chemical reaction (aging) that can cause spots on a book's pages to brown. Foxing looks like an animal has run across the page with dirty paws.
brownish spots caused by chemical reaction within the paper, can be very light to extremely heavy
Describes an unsightly condition where brown or rust colored speckling occurs on paper. This is a result of highly acidic paper reacting to unstable environmental conditions. The problem of foxing mainly develops in books made between 1820 and 1950, when papermaking became widely, and cheaply mass-produced. Today many publishers use acid-free paper to prevent this condition from developing. Look for the designated acid-free mark (otherwise known as the lazy-eight symbol for eternity) on the copyright page of new books.
pale brown spotting often caused when improperly bleached or sized pages have been kept in a humid or inadequately ventilated location
Brown spotting of the paper caused by a chemical reaction, generally found in 19th century books, particularly in steel engravings of the period.
