What is a blue dye?

Printing and dyeing process. Blue dyeing adopts pure natural plant dyes, among which plants such as Polygonum blue and indigo are used as dyes for making clothes and household goods. Blue dyeing process has a long history and rich cultural connotation, which is an important part of China traditional craft. Blue dyeing is not only environmentally friendly and healthy, but also bright in color and soft in texture, which has high practical and artistic value.