Authentic Oshima Tsumugi is made with a decoction of vegetable dyes and iron-rich mud found only in Amami Oshima, Kagoshima Prefecture.

It is a very rare material that uses dyed threads, and is characterized by its unique astringent black color.

The finished pattern is already colored in the state of the thread before it is woven,

The preciseness of the kasuri that weaves the patterned threads precisely is unparalleled in the world.

Through a weaving process called a tightening machine to create the high-precision kasuri threads

After that, to weave the kasuri threads in the vertical and horizontal directions again by hand

It is said that "Oshima weaves twice".