What kind of reaction do you get when you place a penny in balsamic vinegar vs apple vinegar?

When a penny is placed in balsamic vinegar, it may show minimal reaction due to the higher acidity and sugar content, which can lead to a darkening of the copper over time but not significant immediate effects. In contrast, placing a penny in Apple cider vinegar, which is more acidic, can result in a quicker reaction, causing the copper to oxidize and potentially develop a green patina (copper carbonate) as it reacts with the acetic acid. Overall, both reactions involve copper oxidation, but the extent and speed can vary based on the vinegar's composition.