Which iconic color did Penguin Books use for its original fiction titles in its revolutionary color-coding system that helped establish its distinctive brand identity?

Since its founding in 1935, Penguin Books revolutionized publishing by making quality literature affordable and accessible to the masses. Their distinctive color-coded system became one of the most recognizable brand identities in publishing history. Each color represented a specific genre or series, creating an instantly identifiable visual language for readers. This trivia question explores how Penguin's innovative branding strategy transformed books from mere content vessels into recognizable cultural artifacts with consistent visual identity.

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Orange
Green
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Red