What color is fart?

Fart consists of N2, CO2, H2, NH3 and CH4 (there are a lot of CH4 in the fart gas of vegetarians, such as cow's fart. It is said that due to the large number of cows, the total amount of CH4 released by cow fart has reached the point of affecting the atmospheric environment, which not only has an effect on the greenhouse effect, but also does not stink) H2S (especially after eating too many eggs, there is no exercise and deep breathing), onion aldehyde and ammonia rot. Some people even burn because of the high methane content in their farts. There is a video on the Internet that shows a person farting at a candle lit several meters away in a tunnel, and the result is like a flamethrower, emitting a fire dragon with bright light. It is also reported that a doctor is operating on the intestine of an enteritis patient, and the intestine swells due to inflation and suddenly explodes. As a result, the doctor's knife was blown away, and the patient's intestines were blown into several sections, which scared the nurse to cry. Fart is poisonous. In the cabin of a submarine, it only takes several crew members half a day to reach the explosion limit of CH4 in the cabin, and it can be detonated carelessly. Therefore, the submarine's living quarters must be well ventilated, with an average of one person per day. So as far as the composition of fart is concerned, gaseous fart has no color, but liquid fart will turn yellow.