ELI5: Explain Like I'm 5

Tartaric acid

Have you ever eaten grapes and noticed they taste sour? Well, tartaric acid is a chemical that can be found in those grapes that make them taste sour! Tartaric acid is also found in other fruits like apricots, apples, and even some vegetables.

When you eat foods that have tartaric acid in them, your tongue detects the sour taste. Tartaric acid is used in many foods and drinks to add flavor or act as a preservative. It's also used in some medicines and cosmetics.

One interesting thing about tartaric acid is that it can form crystals, which are small, sparkly structures. These crystals are actually called cream of tartar and can be found in baking powder. Bakers use cream of tartar to make cakes and breads rise and become fluffy.

Overall, tartaric acid is a chemical found naturally in some fruits and vegetables that gives them a sour taste. It's used in many different things and can even form sparkly crystals.