Large ceramic jars in a cave located in Sicily, Italy were found containing residues of wine. Analysis was conducted of the chemicals found inside the storage jars, and confirmed to the archeologists that the residues were, in fact, wine dating back around 6,000 years ago. Chemical analysis of residues shows researchers what the residues contain and this confirms what an ancient food or drink is.
When the analysis of the storage jars was complete, it showed that tartaric acid (a main acid found in wine as it naturally develops as the grapes ferment) along with other ingredients found in wine. These findings, along with the research show that wine production started in Italy thousands of years before other research has shown. This means that while it is not the oldest wine in the world, it is the oldest wine in Italy.