• Karasu means crow black point design. And it is so rare.
• Because they are born from deep stratum, hard stones are found.

• In the appearing stratum of a design of a Karasu, there is a case to slightly appear most in the depths of the gallery.
  The crow stone generally dug the gallery more than 150m (0.1mile) almost horizontally; is dead-end.
  There is very little it and brings by probability equal to or less than total 1%.
  Because it was born in a deep place, it is compressed and is tense.
  A Karasu can follow a good blade, but is expensive because there are few numbers.

• Karasu born in many mine(deep place).

• Krarasu is expensive....
  

***dangerous Karas***

There is many toxic Karasu which born in South of Mt.Atago.(Nakayama, Okudo, Ozuku, Shobu, Narutaki)

We give a blade big damage when we use this.
That is include in Harike.
They are splendid visually. However, ... To make matters worse, we do not understand that we do not use it.

 ***Safe Karasu***
Safe KARASU is generally smooth & hard, and it is very good quality.

First from the left is Ohira karasu.
2nd..Nakayama
3rd...Mizukihara
4th...Takashimamyoukakusan
6th...Nakayama