Blue means "leul" in Dai language. Blue is widely used in Dai culture, especially in traditional clothes and silk fabrics. Dai people believe that blue can not only protect themselves from ghosts, but also bring good luck and happiness. In traditional weddings, the bride and groom will use blue satin on their wedding dresses and gowns, symbolizing their wishes for a better future.

Blue is also the representative of Dai culture. In Dai traditional paintings, blue is often used to depict natural landscapes, such as the sky, rivers and peaks, as well as some traditional patterns in myths or legends. In addition, drinking blue tea is also a unique experience in Dai customs. Dai people like to use blue tea as a social way and usually share it with guests at banquets.

Blue also plays an important role in Dai traditional handicrafts. For example, the Dai people's "blue dyeing" technique is to dye silk yarn with natural blue dyes. In addition, Dai people are also good at making traditional ornaments, such as gauze jade or lantian jade, or hand-made with various materials such as bamboo weaving. In Dai culture, blue carries people's love for life and is a symbol of beauty and blessing.