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Citric acid is found in all citric fruits and vegetables (oranges, apples, lemons, limes, pineapples, tomatoes, and most other fruits). It is the sour (acidic) taste in all organic fruits. It is also used to add sour taste to candy, soft drinks, and other sour manufactured goods. It is a natural preservative, this means it can be used to keep jared goods from going bad. such as jams, jellys, canned tomatoes, and all other caned fruits. A noticeable example of citric acid is in every fruit. every fruit is unripe, and eventually ripe. This is the result from citric acid slowly stopping to be a preservative, and wearing off. this is why, for example, an apple is more sour before it is ripe, is because there is stronger citric acid contents in the fruit. People now use it to create the acidic taste in sour dough. Citric acid has been proven to be a beneficial organic product to healthy skin. It is seen in many ice creams, and sorbets because the citric acid helps reduce fat build up. In general it is one of the most useful, and common natural compounds found in our surrounding ecosystem. (citric acid uses)