Xiangyun yarn is a silky fabric with light texture and smooth texture. It is oily and bright, and it is light and cool. It is the ideal material for the summer of the rich and noble people. It uses a kind of plant-specific yam liquid of Guangdong Province to coat the mulberry silk fabric, and then uses the river mud mud near the Foshan to cover the sun. Because the tannin juice containing tannins interacts with the iron ore specific to the local river pond mud, it turns into a blue-black tannic acid iron, which makes the silk fiber wrapped with a layer of potato chips, so the river pond The mud-covered silk surface is blue-black, and the silk bottom is brown-red. It becomes a more silky and silky fabric that wears more oily and brighter.