Ok sometimes i get some bad stones but very very Rare and i get A LOT of stones every week !, this time for the first time ever, i got bad expensive Maruichi Maruka Asagi
It will be very good example to show how confusing to know what stone is bad and what is not.
Only real test is to try the stone !!! Even if it have some very famous stamps on it
Some will think when looking at first picture that i am talking about the dark big line there .
But in fact not at all the dark big line is not toxic at all and can not be field at all
The problem is the smaller lines in the stone they was in fact toxic and scratch both razors knife and tools i try on it, Both small lines in red circle go all the way through the stone so there is not much to do
Now dont think that it is only small lines that can be toxic it could have been other way around, the only thing to do is test the stone and know what to look for and how to test if lines that is toxic or not.
So this Maruichi will go for Very good Tomo Naguras