In ancient China, salt was an extremely important commodity and source of finance. To improve the production efficiency of salt, people invented various salt-making techniques, among which the most well-known is the solar salt-making method. So, in which dynasty was the solar salt-making method invented?

The solar salt-making method, as its name suggests, is a method of evaporating sea water through solar radiation to obtain salt crystals. According to historical records, the solar salt-making method first appeared in the Song Dynasty. During this period, China's social economy developed rapidly, and the demand for salt increased significantly. The traditional boiling salt-making method could no longer meet the demand. Therefore, people began to look for more efficient and economical salt-making methods.

Before the Song Dynasty, China's salt-making technology was mainly the boiling salt-making method, which evaporated sea water through heating and then collected the remaining salt. Although this method was effective, it was costly and inefficient. By the Song Dynasty, with the advancement of technology and social development, people began to experiment with new salt-making methods. The solar salt-making method emerged against this background.

The appearance of the solar salt-making method greatly improved the production efficiency of salt, reduced costs, and made salt more affordable. At the same time, this method is also more environmentally friendly, does not require a large amount of fuel, and has less damage to the environment. Therefore, the solar salt-making method quickly spread throughout China and became the main salt-making method.

Overall, the solar salt-making method is the crystallization of the wisdom of the ancient Chinese people. Its emergence not only changed China's salt-making technology but also promoted the development of social economy. Even today, the solar salt-making method is still the main salt-making method in some coastal areas, and its influence can be seen.

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