What is all-pass, six-pass and two-pass?

Silk reeling, also called carved silk, is the essence of traditional silk works of art in China.

a unique silk weaving craft product in China tradition. During the Northern Song Dynasty, its origin was in Dingzhou, Hebei Province. After the demise of the Northern Song Dynasty, the artists who made silk reeling came to Jiangsu and Zhejiang provinces with the establishment of the Southern Song Dynasty, and brought the silk reeling technology to the south.