Which color was specifically reserved for luxury goods in Ancient Roman marketplaces, serving as the equivalent of modern 'premium brand' signaling?

The ancient Romans were master merchants who understood consumer psychology and retail engagement long before modern marketing existed. Their marketplace colors weren't random - they used specific hues to attract customers, indicate product types, and establish merchant identities. This strategic use of color psychology in Ancient Roman commerce shows remarkable parallels to modern brand color strategies. Test your knowledge about this fascinating aspect of ancient retail!

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Purple (Tyrian purple), extracted from murex shellfish and representing wealth and imperial connections
Gold (Aurum), symbolizing the sun god Apollo and suggesting divine blessing on purchases
Venetian Red (Sinopia), signifying items imported from the Eastern trade routes
Indigo Blue (Indicum), indicating goods that had traveled across sea routes and were therefore exotic