How to identify Shu brocade?

The craftsmanship and processing method of Shu brocade is determined by the characteristics of mulberry silk. First of all, reeling (the ancient name for silk), and then from the thread (square silk frame) to take down the stranded raw silk. The silk is composed of a number of cocoon filaments, and each cocoon filament is composed of hundreds of microfibers, these microfibers with the help of silk glue coagulation, that is, in the surface layer of raw silk wrapped in a layer of silk glue, feel rough and hard, thus affecting the luster and dyeing, and also in the silk glue contains waxes, gray powder and various pigments, must first be refined, remove the silk glue to dyeing. During the Han and Tang dynasties, Chengdu's brocade workers to deal with the dyed silk threads and other silk products in the south of the city in the flow of the river washing, hanging in the sun, the flow of the river that is dyed along the centralized washing place. Accordingly, the Liujiang River was called "Maundy Jinjiang" or "Jinjiang" in ancient times. The most unique thing is that the upstream water of "Maundy King River" comes from the snowy water of high mountains, the river water is clear, and the water contains many kinds of metal ions, oxides and organics, and when the threads dyed by grass and wood mordant are washed in the river, they will be combined with the metal ions and part of the organics, and the combination will be precipitated in the threads and form a heavy mordant dyeing with color precipitation, which makes the color of brocade silk yarn more colorful, with better fastness, and makes the silk threads more colorful, with better fastness. It makes the color of Shu brocade silk thread more colorful and the fastness better.