Getting Into The Groove

About 40% of suriage and ubu katana have bohi which is a simple groove which fills the shinogi area of the blade. Recently on nihontomessageboard.com a question came up about the strength effect on blades. 

I wrote about this a long, long time ago but it bears some updating here, about why a blade has grooves and what the effects are function wise. 

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Context

This came up recently advising  someone about a nidai Tadatsuna sword. The owner had a fine specimen of more than premium length and ranked Tokubetsu Hozon, and he was happy with the piece and it represented this smith in his collection. Probably the sword sold for what appeared to be a budget friendly price, as this is a famous smith and well regarded it was bought and added to this collection.

There are details though that apply to these things that are not always evident to buyers. I’ll go over a few examples.

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