Which color is most commonly used on bestselling thriller/suspense novel covers to create tension and intrigue?

Book cover design is a sophisticated art form that uses color psychology to attract specific reader demographics. Publishers invest heavily in cover design research, as it significantly impacts consumer purchasing decisions. Different genres typically employ distinct color palettes to signal content and appeal to target audiences. How well do you understand the strategic use of color in literary marketing?

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Black (often with red accents)
Bright yellow (for attention-grabbing visibility)
Deep purple (to signify mystery and sophistication)
Forest green (to represent danger lurking)