The lights won't go out at night.

Ancient tombs are frequented by grave robbers, and the ever-burning lamps of ancient tombs were first discovered by grave robbers. These grave robbers are often stunted, and their grave robbing skills are superb. They can divide gold, locate caves, see feng shui and explore the terrain.

The ever-burning lamp placed in the underground palace of the mausoleum will gradually consume oxygen due to the decomposition of organic matter in the corpse, silk and funerary objects after the stone gate is closed and isolated from the outside world, and the concentration of carbon dioxide in the whole closed space will continue to increase, and it won't be long before the ever-burning lamp will automatically go out. For example, the ever-burning lamp in Dingling of Wanli Emperor, the wick and wax lamp in the large porcelain jar of cucumber only consumed a little, which proved that the ever-burning lamp did not burn for long after the underground palace was closed.

The ever-burning lamp in Qin Shiwang's tomb circulated in China is made from human fish oil to prolong life. Human fish oil is just a legend, which may change according to historical changes. It is true that some fish can burn for a certain period of time, such as whale oil.

According to scientists' calculations, whale oil can burn for 5000 days per cubic meter, which is 14- 15 years. Another way to keep the brightness is white phosphorus. Anyone who has studied chemistry knows the characteristics of white phosphorus. In fact, white phosphorus will never die after it is ignited.

There is a kindling substance called white phosphorus in the ever-burning lamp. The ignition point of this white phosphorus is about 30 to 40 degrees, and it can even be ignited by wind friction. Rub white phosphorus into the wick, the temperature reaches, there is oxygen, and the ever-burning lamp will light up.

On the other hand, when the tomb door is closed, the ever-burning lamp will go out, because the oxygen will soon burn out until the next tomb door is opened and new oxygen will enter. Therefore, A Ring of Endless Light is just an illusion.

Most ancient tombs are very dark when they are excavated and opened. However, there are some ancient tombs in the world, which have faint candlelight after opening. The ever-burning lamps can be found in many ancient tombs with high specifications, such as emperors and nobles. Although most of the ever-burning lamps were extinguished when they were discovered, there were still some ever-burning lamps that were not extinguished until they were discovered.