Which branding technique did Roman merchants commonly use to distinguish their wine amphorae in competitive markets across the Mediterranean?

The ancient Romans weren't just master architects and military strategists—they were also pioneers in retail branding! Long before modern logos and trademarks, Roman merchants developed sophisticated methods to distinguish their products in bustling marketplaces across the empire. This trivia question explores how ancient Roman businesses created brand recognition in a world without digital marketing or mass production.

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Stamping clay seals with unique merchant emblems on amphora handles
Painting detailed mythological scenes that told stories about the wine's origin
Attaching small metal tokens with the merchant's name cast in relief
Carving elaborate geometric patterns unique to each vineyard estate