The Local color reference article from the English Wikipedia on 24-Apr-2004
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Local color

Local color is a type of writing that was popular in the late 19th century. This style relied heavily on using words, phrases, and slang that were native to the particular region the story took place in.

A well-known local color author was Mark Twain with his books Tom Sawyer and The Adventures of Huckleberry Finn.

Failed attempts to use local color correctly have resulted in considerable criticism for some authors.