Tanaka Toishi - Natural Stone - Yaginoshima - Type 40

1-5 Scale: 1 = Less, 5 = More
Hardness Level: 2.5
Scratch Depth: 4
Speed: 4
Wear Rate: 2.5
Self Slurry: 3.5
Ease of Use: 4

Recommended Uses: Lighter repairs and bevel setting, toothy edges, very hazy kasumi, first or second stone in a polishing sequence. 

Notes: Amakusa tend to have a poor reputation because they are inexpensive and sometimes inconsistent if poor quality (no surprise there). But we have found quality options that are sourced from trustworthy suppliers to be actually quite good, and an awesome option for beginners. Their price and availability are a plus, but they are also efficient and easy to use. They have decent shaping power, and their wear rate is not too extreme. They are slightly tighter and finer than other coarse stones such as Omura or Akamatsu. If you finished off of it, you would have an aggressive toothy edge, or a very hazy Kasumi on bevels. Also good as an earlier stone in a polishing progression. 

Disclaimer: Given the natural aspect of these stones, all subjective qualities are our estimates and may vary slightly from your exact expectations and assessment. The images shown and characteristics described are an example. If purchased, yours may differ slightly in appearance and qualities. Dimensions, weight, and stamps may be different from listed if it has been tested.

Brand: Morihei 森平
Dimensions: 219mm x 78mm x 40mm
Weight: 1394g

Gorgeous Shima (stripped) Botan Nagura from the famous Mikawa mine in Aichi Prefecture. Difficult to find this size and purity. On the harder side. Very fast scratch removal, consistent scratch marks, good polishing with an added nagura, and some sweet edges. Fine specimen.

*Special selection Uchigumori*

Recommended Usage: Final polisher, pre polisher, sword sequence, push cut tools, edges, microbevels.

Notes: An extremely fast, easy to use, versatile, flawless, premium select piece; one of the nicest stones we've carried. This is one of those stones that make you feel like you're cheating since it makes things so easy. Even a novice polisher can use this to outstanding results. Sealed in cashew lacquer. Will last a lifetime.

Please Note: Given the natural aspect of these stones, all subjective qualities are our estimates and may vary slightly from your exact expectations and assessment. The images shown and characteristics described may be from a previous example. If purchased, yours may differ slightly in appearance and qualities. Dimensions, weight, and stamps may be different from listed if it has been tested. 

Brand: Tanaka Toishi 田中砥石工業所
Dimensions: 220mm x 82mm x 45mm
Weight: 1573g

Notes: Really nice specimen from the famous Mikawa mine in Aichi Prefecture via the famous Tanaka Toishi brand. They are firm to hard, and quality specimens are fast and give good polishing results. Generally easy to use depending on the hardness.

Suggested Use: pre or final polisher for knives and push-cut tools.

Background Info: Nagura is made of lithified tuff, which is silica-rich stratified volcanic ash that has been compacted into a solid over many, many years. They contain very fine particles of silica (and other  which are often more friable than other sedimentary stones, and thus are ideal for polishing. They are used as one of the last stones before Uchigumori in a traditional sword polishing sequence. The word "Nagura" is the named after the individual who discovered the utility of the lithified tuff as a whetstone, Sakon Nagura, over 700 years ago.

Please Note: Given the natural aspect of these stones, all subjective qualities are our estimates and may vary slightly from your exact expectations and assessment. The images shown and characteristics described may be from a previous example. If purchased, yours may differ slightly in appearance and qualities. Dimensions, weight, and stamps may be different from listed if it has been tested.

Brand: Tanaka Toishi 田中砥石工業所
Dimensions: 225mm x 86mm x 44mm
Weight: 1615g

Notes: Really nice specimen from the famous Mikawa mine in Aichi Prefecture via the famous Tanaka Toishi brand. They are firm to hard, and quality specimens are fast and give good polishing results. Generally easy to use depending on the hardness.

Suggested Use: pre or final polisher for knives and push-cut tools.

Background Info: Nagura is made of lithified tuff, which is silica-rich stratified volcanic ash that has been compacted into a solid over many, many years. They contain very fine particles of silica (and other  which are often more friable than other sedimentary stones, and thus are ideal for polishing. They are used as one of the last stones before Uchigumori in a traditional sword polishing sequence. The word "Nagura" is the named after the individual who discovered the utility of the lithified tuff as a whetstone, Sakon Nagura, over 700 years ago.

Please Note: Given the natural aspect of these stones, all subjective qualities are our estimates and may vary slightly from your exact expectations and assessment. The images shown and characteristics described may be from a previous example. If purchased, yours may differ slightly in appearance and qualities. Dimensions, weight, and stamps may be different from listed if it has been tested.