Wow, what a stone. It is so easy to use, has excellent feedback and is a treat to look at. The kind of stone that grabs your attention and keeps you focused. It has silky mud that comes up fairly fast hence the 3.5 level hardness, but it leaves a bright core steel. At this hardness level, it is uncommon to get varying finishes with dry mud, but this stone can do it. A great stone for any level of expertise. Only issue is the corner.
Weight: 1490 grams
Hardness/Fineness: 3.5 / 4-4.5 (variable polishes with pressure and water control)
Roughly translating to ‘egg shell’, these highly sought after stones are typically on the harder side with a high level of fineness. Sometimes kiita colors show up on softer layers of tennen toishi. When softer, these types of stones are remarkable knife polishers and final finishers for edges. When on the hard side, these stones are meant for final razor/chisel finishing.
Iromono is a term that represents a broad range of colors, usually purples, oranges, yellows, and greens. Usually the colors are shown in swirls and waves. A lot of nice Shoubudani and Ohira polishing stones feature Iromono color palettes.
Translated to “crow”, this is a beautiful patterning that looks like black blotches on the stone. Karasu comes in different intensities, a lighter karasu is typically highly sought after for being less scratchy. Very dense karasu patches in whetstones are usually very expensive, but tend to be very hard.