No, Xiangyun yarn itself has no sour taste. It may be that a chemical component was added in the production process, so it won't be sour after washing it with mild laundry detergent after buying it home.

Distinguish between true and false:

1, combustion judgment: the grey fabric of Xiangyun yarn is mulberry silk. The higher the purity, the lower the ignition point, and it will go out soon after burning. When burning, the smoke emitted is white, accompanied by protein burnt smell (singeing smell) from burning feathers. After burning, dark brown balls are formed, and the fingers will be broken when rolled. Chemical fiber materials burn with black smoke and pungent smell, and the ash powder is black and touches hands.

2. Fabric characteristics: Due to the particularity of Xiangyun yarn production and processing, it is normal that there will be a small number of black spots, red spots, brown spots and white spots on the fabric, which is a special symbol that distinguishes it from true and false Xiangyun yarn. There is also a nice name called Toulange, which means that the printing and dyeing process on the back is dyed to the other side through the fabric, making the fabric look uneven in color.

3. Handfeel judgment: Some fans of Xiangyun yarn deeply contact with enough Xiangyun yarn fabric, which will form a freehand recognition ability. Xiangyun yarn fabrics are divided into many kinds, which are soft, hard, rustling and heavy. No matter what kind of Xiangyun yarn fabric is very breathable, it will feel transparent in the sun, which is not available in other fabrics.