Why are the oranges that you buy in store bright orange colored while ones pick off of trees dull color?

The oranges that you buy in the store are typically a brighter orange color than those you pick off the tree because they have been treated with ethylene gas. Ethylene is a natural plant hormone that helps fruit ripen. When oranges are exposed to ethylene, they produce more of the pigment carotenoid, which gives them their orange color.

Oranges that are left to ripen on the tree naturally will eventually turn a similar bright orange color, but it may take several weeks or even months. By treating oranges with ethylene gas, farmers can speed up the ripening process and get their oranges to market more quickly.

In addition to ethylene gas, some oranges may also be treated with other chemicals to improve their appearance or extend their shelf life. These chemicals can include waxes, fungicides, and preservatives.

If you are concerned about the chemicals that may be present on your oranges, you can buy organic oranges. Organic oranges are grown without the use of synthetic pesticides, herbicides, fertilizers, or other chemicals. They may not be as bright orange as conventionally grown oranges, but they are still just as delicious and nutritious.