What is printing and dyeing?What is the origin of the development of printing and dyeing?

Printing and dyeing is also called dyeing and finishing.It is a kind of processing method,also known as pretreatment,dyeing,printing,finishing,washing,etc.;undergraduate dyeing and finishing major has now been incorporated into the light chemical engineering major;as early as 6000 or 7000 years ago in the Neolithic age,our ancestors were able to dye linen red with hematite powder.The primitive tribes living in the Nuomuhong area of Qaidam Basin,Qinghai,can dye wool into yellow,red,brown,blue and other colors,and weave woolen cloth with color stripes.During the Shang and Zhou dynasties,dyeing technology was constantly improved.In the palace handicraft workshop,there were full-time officials"dye people"to"dye grass"to manage dyeing production.The color of the dye is also increasing.By the Han Dynasty,dyeing technology had reached a fairly high level.