There is never bird droppings on the roof of the Forbidden City. Why is it so clean for more than 600 years?

Hundreds of years ago, Kyle Poirot first entered the Forbidden City, and he was amazed at the glittering roof. After he returned to China, he told others what he had seen and heard. What westerners expected most was China arachis duranensis. Kyle Poirot has such an exaggerated idea, probably because of this glittering glazed tile palace roof!

The Forbidden City is the epitome of China's architectural skills, and its roof is definitely not as simple and beautiful as it looks. Architects at that time had considered all the problems that could be foreseen at that time when designing. Today, hundreds of years later, when we see this golden roof again, we will be very surprised at its brightness and neatness. Glazed tiles not only keep the color of the year, but even bird droppings are rarely seen. Why?

First of all, the design of the roof of the Forbidden City has considered the problem of bird droppings. The roof of the Forbidden City has a steep slope and the spacing between tiles is also ingenious. It is difficult for birds to grasp the roof of the Forbidden City. When they stand on it, they slip easily, so they seldom sit on it. Moreover, because the glazed tile is very smooth and has a large slope, even if bird droppings fall on it, it will be easily washed down when it rains, and even the dust that falls on it will be washed down by the rain.

If you have been to the Forbidden City on a rainy day, you will definitely have the impression that rain is flowing down from glazed tiles, which is a very beautiful water curtain. The roof of the Forbidden City is an important part of the drainage system of the Forbidden City, which can not only reduce the water accumulation on the roof, but also make the rain a different scenery of the Forbidden City, which makes people who enjoy the rain relaxed and happy, thanks to the royal golden glazed tiles on the roof.

In fact, the small royal glazed tiles in the huge Forbidden City contain the great wisdom of the ancients. A glazed tile goes through 36 processes from shale powder to final color fixing. This kind of golden glazed tile is not only high in strength and water absorption, but also very smooth. It is used on the roof and does not need special maintenance or cleaning by future generations.

What is the standard of royal glazed tile? Do not crack in a big shape, and do not take off the glaze for a hundred years? Yellow is the color of loess in ancient people's cognition, representing the earth, foundation and center. Gradually, it developed into the exclusive color of the royal family and represented the face of the royal family. In the Qing Dynasty, there was a strict management system for the production and use of glazed tiles. Without the royal permission, it is absolutely impossible for ordinary people or officials to use this glazed tile in their buildings. Even in royal buildings, the regulations on glass color are quite strict. Only Prince Mi's county and Wang Fu can use green glazed tiles, while Belle Beizi and others can't even use green glazed tiles.