What is "redburn"

Redburn: His First Voyage is the fourth book by the American writer Herman Melville, first published in London in 1849. The book is semi-autobiographical and recounts the adventures of a refined youth among coarse and brutal sailors and the seedier areas of Liverpool. Melville wrote Redburn in less than ten weeks. While one scholar describes it as "arguably his funniest work," scholar F.O. Matthiessen calls it "the most moving of its author's books before Moby-Dick".