Which precious dye, associated with Phoenician merchants, became so synonymous with luxury and status that it was restricted to royal use in ancient Rome and became a 'brand color' for imperial products?

Before modern advertising and marketing, ancient civilizations had their own methods of brand recognition and identity. Specific colors were often associated with power, divinity, and commercial prestige, influencing how goods were presented and traded. This poll explores how color psychology in marketing has roots dating back thousands of years, and tests your knowledge of how certain ancient civilizations used distinctive colors for commercial and status purposes.

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Tyrian purple (extracted from murex shellfish)
Egyptian blue (world's first synthetic pigment)
Malachite green (mined in Ancient Greece)
Cinnabar red (used in Chinese imperial seals)