Which color was so expensive and exclusively reserved for royalty in ancient Rome that commoners were forbidden by law from wearing it?

Before modern marketing departments and color psychology studies, ancient civilizations understood the profound impact of colors on human perception. From religious ceremonies to royal declarations, specific colors were deliberately chosen to convey authority, divinity, and social status. This poll explores how ancient civilizations strategically used color in their 'branding' and how these associations continue to influence modern color marketing.

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Tyrian Purple (extracted from thousands of murex sea snails)
Cinnabar Red (derived from toxic mercury sulfide)
Egyptian Blue (world's first synthetic pigment)
Royal Gold (processed from refined gold leaf)