Purplish blue salt is produced in Qinghai-Tibet Plateau, and it is rich in various minerals and trace elements, which is beneficial to health. Regular navy blue salt must undergo strict screening, purification and processing to provide high-quality salt products. Purplish blue salt, also known as Tibetan salt or Qinghai salt, is a kind of natural rock salt collected from the surrounding areas of Qinghai Lake in China, so it is named because it is located on the Qinghai-Tibet Plateau. Navy blue salt is a kind of natural salt containing many minerals, with high content of minerals such as potassium, magnesium and calcium and light taste.

Navy blue salt is called navy blue salt because it is produced in Mongolia and Tibet, and its color is white and blue. It is often used in cold salad and stir-fry, and it tastes salty and fresh, which is suitable for people who are not suitable for iodized salt.

Introduction to the historical evolution of sea salt;

The coastal areas of China have unique conditions for producing sea salt. As early as the time of Emperor Yan Shennong, Su Sha began to "cook the sea to get salt". Xu Shen's Shuo Wen Jie Zi in the Eastern Han Dynasty: "The ancients first used sea salt with sand." Su Sha is Su Sha, the minister of the Yellow Emperor and the vassal of the Yan Emperor. He lives in Laizhou Bay in Bohai Sea, Shandong Province. In 1950s, the production equipment (ceramic cookware) for "cooking the sea to get salt" in Yangshao culture period was unearthed in Fujian.

At the beginning of the 20th century, China produced about 20 million tons of sea salt, making it one of the largest countries in the world. According to its region, it can be divided into northern sea salt area and southern sea salt area. The northern sea salt area includes Liaoning, Tianjin, Hebei, Shandong and Jiangsu, with Shandong and Hebei as the main producing areas. The southern sea salt area includes Hainan, Guangdong, Guangxi, Fujian, Zhejiang, Taiwan Province and other places, with Fujian and Zhejiang as the main producing areas.