When it comes to jeans, there's also the Fed!!
"Indigo" is one of the oldest dyes known to people...for over 5000 years, with indigo dyeing starting with plants of the genus "Nature Indigo", but most jeans today are synthetic dyes in the lab, also known as "Pure Indigo".
Both dyes use completely different techniques...but it must be understood that indigo dyeing does not use dyeing that dips cotton into it, it has many factors and processes that will make the indigo color stick to the texture of the cotton.
In order to dye, it must be dyed at the molecular level that requires other
additives to help, which occurs in the process of oxidizes when the dyed fabric is exposed to light and oxygen.
Indigo dyeing is dyed only on the sides.
But the yarn in vintage denim is stained with the process of "Rope Dyeing", which is a dip in the indigo dyeing in the pond several times. And every time you dip, it only takes a short time to emphasize the continuity of the indigo color on the outside of the yarn, and the thread inside is also white.
Once we know how
indigo gets stuck in the fabric, if the process is out ?? The fading part is caused by friction that occurs in our genes both when walking. Wear your wallet or do activities continuously until wrinkles occur according to the patterns we wear. These wrinkles are caused by friction, causing the dyed indigo color to fall off only the white thread.