Ethylene, C2H4, is a colorless flammable gas derived from natural gas and petroleum and used as a source of many organic compounds. It is a plant hormone that will be produced as ripening begins. Ethylene is in responsible for texture changes, softening, color, and many other processes involved in ripening. Besides causing fruit to ripen, it can cause plants to die because it can be produced when plants are injured. Some of its effects include fruit ripening, loss of chlorophyll, and stem shortening. Ethylene gas is often used commercially. Examples of fruits that produce ethylene are apples and bananas.