How to dye the moon blue?

The steps of blue dyeing the moon are as follows: preparing materials: a bucket with a cover, with a capacity of more than 5 liters; Indigo dye, reducing agent (sodium dithionite), caustic soda; Rubber gloves; Clothesline and clothes peg; Fabric (cotton, linen, silk, etc.) used for dyeing. )+test cloth. Then start dyeing.

Few people know that the blue dyeing technology was actually introduced from China. Indigo of blue jeans has been used to dye clothes for thousands of years, and China's records first appeared in Qin and Han Dynasties. Blue dyeing refers to the printing and dyeing process of fermenting and precipitating the leaves of indigo plants, extracting pigments, and then adding special substances for catalytic reduction coloring.

Shine on you is Better than Blue refers to this process. Indigo is extracted from Polygonum, but its color is bluer and darker than Polygonum.

Indigo plants are common in China, Japanese, Indian, Egyptian, African and Central and South America. Today's indigo fabric is also easy to get, but indigo was a rare item in the past.

According to the degree of fermentation and the number of dyeing, blue dyeing can form rich tones, from light blue to navy blue and black blue.

Because the color saturation, purity and fixation rate of synthetic indigo are far superior to those of plant indigo, almost all denim today is dyed with synthetic indigo.