Japanese Natural Whetstone Mukōnochi Aisa Karasu 521g selected by the Yamamoto family for razors.
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- Product Code: Mukōnochi Aisa Karasu 521
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Japanese text: 正本山 向ノ地町 あいさからす
向ノ地町 — Mukōnochi area.
あいさからす (Aisa Karasu) — a variety of stone with a karasu ("raven") pattern.
About the stone itself:
Size - 136x80x20 mm, 521g, Hardness 4.5-5, Extremely high quality 10,000+
Greenish-gray Asagi; thin reddish line - does not interfere with sharpening; fine, uniform structure; dark bark. An excellent sharpening stone for razors, tools, and knives.
The Mukōnochi site (向ノ地 / 向之地 / 向地) is not a single mountain, but a site (a vein) in the Umegahata (梅ヶ畑) mining area, which historically belonged to the Ohira (大平, Ohira) group of mines.
More precisely:
Umegahata (梅ヶ畑) is a natural sharpening stone mining area northwest of Kyoto.
This area was home to famous mountains and mines: Ohira, Nakayama, Shōbudani, Ozuku, Narutaki, Mizuhara, and others.
Mukōnochi (向ノ地) is the name of a specific area (vein), not an individual mountain.
Old Yamamoto and Nakayama Maruka catalogs contain the following stamps:
Masamotoyama Mukōnochi (正本山 向ノ地)
Masamotoyama Mukōnochi
These stamps specifically indicate the stone's origin from the Mukōnochi area. In the 1960s–1980s, sellers often wrote: Mukōnochi (正本山 向ノ地)
and many assumed that Mukōnochi was the name of the mountain. In fact, this is the equivalent of the direction: "Mount Ohira, Mukōnochi site"
as they say today, "quarry No. 3" within a larger deposit.
What is known about Mukōnochi stones
According to Japanese craftsmen and collectors:
they are usually yellow-green and gray-green awasedo;
most often medium to hard;
very pure;
works well on carbon steel;
both very fine finishes and universal awasedo are found.
