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

In the publishing industry, color psychology plays a crucial role in book cover design and marketing. Publishers carefully select color schemes that appeal to specific audience demographics and convey the book's genre before a potential reader even reads the title. This trivia question explores how major publishing houses use brand colors strategically in their visual merchandising to influence consumer behavior and drive sales in the competitive literary marketplace.

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Red (often combined with black for danger and intensity)
Light blue (to create a calming contrast with intense content)
Yellow (predominantly used to signify caution and psychological elements)
Green (to symbolize envy and deception in character relationships)