In ancient Rome, what innovative packaging technique did olive oil merchants develop to distinguish their premium products from competitors?

The ancient world had sophisticated retail strategies and product packaging long before modern marketing emerged. From the bustling markets of Mesopotamia to the trade centers of Rome, merchants developed ingenious ways to package, brand, and sell their goods. This poll explores how ancient civilizations approached product packaging innovation - a fundamental aspect of commerce that helped differentiate products and communicate value to customers thousands of years ago.

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Amphorae with distinctive colored seals that indicated the oil's origin and quality grade
Glass bottles with embossed merchant symbols that could be returned for a small refund
Ceramic containers painted with scenes depicting the specific olive groves where the olives were harvested
Wax-sealed clay jars inscribed with poetic descriptions of the oil's flavor profile