What is Aizen?
"About indigo building ④"
This time, I would like to add an explanation about indigo building from a different angle.
There are several methods for "Aiken".
"Natural lye fermented"
It is a method of building with only natural materials, and the one dyed with this is the so-called "honaizome" or "shoaizome". This name is considered to be an expression used to make a clear distinction from those using the chemicals described below.
Since it refers to the general addition of [natural materials only] to 蒅, the materials to be added vary depending on the dyer, and are not limited to the materials I have introduced so far.
The dyed color of the material I introduced cannot be dyed dark unless it is repeated many times, but the dyed color is clear, deep and three-dimensional, and the bottom of the color is reddish and complex. It can be confirmed that it is tinged with. On the other hand, if the building and management look loose, or if the dyeing method is simple, you cannot expect its beauty. This is the reason for the difficulty of building naturally. If they are dyed, depending on the frequency of washing, the redness will disappear and the blue will become clearer over time, and you can enjoy the indigo color for many years.
"Chemical construction"
It is a method of building using chemicals instead of natural materials in order to activate the reducing bacteria of 蒅.
It is easy to build and relatively easy to manage without having to detect the subtleties of the indigo state that you would build with natural materials. The smell is quite different from the one built in nature. At first glance, the dyeing is vivid, but the dark color can be dyed in the first few times, so there is no depth and it is flat. There is not much difference in the quality of dyeing. Fading can also be seen early.
"Mixed building"
It is the sum of the ones made of natural materials and the ones made of scientific indigo or synthetic indigo. You can use it forever if you keep adding. It is also called "waridate".
It is a method from the time when chemical dyes were imported, and in order to compete with chemical dyes, such a method was devised so that it could be mass-produced while retaining the indigo color.
"Synthetic indigo"
No 蒅 is used, and the raw material is a dye made from a substance extracted from coal tar. It is recognized as indigo dye because the substance is scientifically the same component as indigo pigment. If you add chemicals, it will be in a state similar to when you built indigo, but the smell is completely different and the appearance is rough granules. No management required. It is indigo dyeing that anyone can do very easily. Also known as "Indigo Pure". After dyeing, it is colored even faster than "Chemical Building", and a very dark color is dyed from the first time. Fading is also quick.
It seems that many of the products sold in the streets called "Aizen" use this synthetic indigo.
Even if you unravel the items that are sold together with "Aizen" in one go, there is a clear difference in each item. If you wear the item, the change will be obvious over the years.
I think the most important thing is to meet what you call, but I think it would be even better if you could know what kind of dyeing was applied to it.