How can one speed up the ripening of tomatoes?

Using ethylene gas is an effective method for speeding up the ripening process of tomatoes. Ethylene is a naturally occurring plant hormone that plays a crucial role in the ripening of many fruits, including tomatoes. When tomatoes are exposed to ethylene gas, it stimulates the ripening process by triggering various biochemical reactions. These reactions lead to the breakdown of chlorophyll, softening of the fruit, and the development of flavor and aroma compounds that characterize ripe tomatoes.

While applying water can help maintain hydration and firmness, it does not directly influence the ripening process. Similarly, exposing tomatoes to sunlight can warm them up, but it does not trigger the biochemical changes necessary for ripening in the same way that ethylene does. Storing tomatoes in the refrigerator actually slows down the ripening process due to the cold temperature, which is not suitable for optimal ripening. Thus, utilizing ethylene gas is the most effective way to accelerate the ripening of tomatoes.