Which color was used for Penguin's original paperback fiction titles in their famous tri-band design launched in 1935?

In the world of book publishing, brand colors can become as iconic as the literature itself. Since 1935, Penguin Books has used a distinctive color-coding system for different genres of literature that has become legendary in publishing design. This trivia question explores how color and visual identity have shaped one of the most recognizable brands in literary history.

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Orange
Green
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Red