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Vasilis, thank you for nice explanation. I will not use another acid. I will try to translate whole kanji stamps on stone and search more info.

Vasilis, thank you for great link!

There are little chance get another stone. Stone is from auction of old tools. If I will see another i will buy.

Very good trick with acid. Thank you! I tried 8% acetic acid (vinegar). Foam was not created. Only some bubbles has been created in a drop of vinegar. Bubbles disappeared in about 5 minutes. Maybe...

Can anyone identify this hone please? I have two specimen. Both purchased in Japan. I tested only smaller stone. Stones description:


It's very consistent finisher producing mirror surface...