Which color is most commonly used on thriller/suspense book covers to trigger psychological tension in potential readers?

Book covers are crucial marketing tools in the publishing industry, often determining whether a potential reader picks up a book or scrolls past it online. Publishers invest significant resources in cover design psychology to influence consumer behavior. This poll tests your knowledge about how publishers strategically use design elements to position their products in the competitive literary marketplace.

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Red (often with black accents)
Blue (often with silver accents)
Green (often with gold accents)
Purple (often with white accents)