What is foul paper?

Foul paper refers to a manuscript or copy of a document that is marked with errors, corrections, or alterations made during the writing process. It is also called "blotted paper" since the mistakes are usually blotted or crossed out. Foul paper can be found in various literary works, including Shakespeare's plays, where the original manuscripts are filled with corrections and revisions. These documents provide important insights into the author's writing process and the evolution of their work. In modern times, with the use of digital documents, foul paper has become less common, but the term is still used to refer to any manuscript with visible corrections or errors.