A Japanese indigo dyeing studio KOSOUEN has still kept dyeing in an authentic and traditional method.
You're going to dye a handkerchief by soaking and rubbing the cloth in a vat filled with indigo liquid. You can make your own handicrafts and take it home as a souvenir.
There is a showroom in this studio where we can buy their original products.
Indigo is called “Ai” in Japanese that is deep blue color as you can see the picture below.