The difference between various dyes
There are basically 4 kinds of dyes, the most important ones are reactive dyes (also known as reactive dyes) and shilin (vat dyed, also known as vat dyes). Among them, the color fastness of Shihlin is the best. But one thing is very important, one dye cannot cover all the color spectrum, some colors can only be made with one dye, such as navy blue, which can only be used reactive. The color spectrum of Shihlin is dominated by medium and light colors.
There is also a kind of paint, which fades badly after washing, and is often used by customers who pursue the old feeling after washing. The color fastness is very poor before washing, but fair after washing.
There are also sulfur dyes, which are basically eliminated. They are used for the black color of corduroy, have poor color fastness, and have a strong corrosive effect on cotton fibers. The tear strength is poor over time.