Which color is most commonly used in horror book covers to trigger psychological tension and fear?

In the competitive world of publishing, book cover design is crucial for capturing reader attention. Color psychology plays a significant role in how publishers market different literary genres. This trivia question explores how publishers strategically use brand colors to signal genre conventions and influence purchasing decisions in bookstores and online platforms. Test your knowledge about the fascinating intersection of visual marketing and literature!

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Red (representing blood, danger, and intensity)
Black (representing darkness, mystery, and the unknown)
Purple (representing supernatural elements and mysticism)
Green (representing decay, illness, and the unnatural)