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Shohonyama Karasu・Natural Finishing Stone・Awasedo・Kyoto, Japan #50
Shohonyama Karasu・Natural Finishing Stone・Awasedo・Kyoto, Japan #50
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Shohonyama Karasu from Kyoto. A hard finishing stone known for its distinctive dark “Karasu” (crow) patterning. Fine abrasive character in the 8000+ range, offering crisp feedback and precise control. Suitable for final refinement and clean edge definition.
You will receive the stone shown in the pictures.
Full Description
Full Description
The term Karasu (crow) refers to the dark, irregular patterns visible within certain layers of Kyoto natural whetstones. These markings are understood to be trace fossils (ichnofossils), formed by ancient organisms moving across the deep-sea sediment before lithification. Rather than surface staining, they are part of the stone’s internal geological structure.
Shohonyama (正本山) historically designated whetstones mined in the Kyoto region before individual mountain branding became common. Stones from this broader Kyoto sedimentary system were collectively referred to as “Shohonyama,” without specific quarry names. As such, the term indicates origin within the traditional Kyoto whetstone mountains rather than a single mine.
Karasu layers are typically associated with harder stones and a refined abrasive structure. In use, this stone presents a firm, controlled feel with minimal dishing and a tight slurry response. The abrasive particles are fine and well integrated, allowing for high-level finishing where clarity of feedback and edge precision are prioritized over rapid material removal.
Geologically, Kyoto stones formed within a deep marine sedimentary environment, where silica-rich muds compacted over geological time. Variations in pressure, organic activity, and mineral concentration created the distinct internal patterns seen in Karasu pieces.
This stone is well suited for final finishing stages in a traditional progression. It supports subtle edge refinement, clean bevel definition, and controlled polishing without excessive softness or unpredictable slurry behavior. The selected piece represents a balanced Karasu example with structural consistency and reliable finishing performance.
Materials
Materials
Natural Whetstone - Shohonyama Karasu
Measurements
Measurements
Length: 20,8 cm
Width: 8 cm
Height: 2,8 cm
Weight: 1131 g
Hardness: ●●●●◐ (4,5/5)
Care Guide
Care Guide
To preserve the character, performance, and longevity of your natural Japanese whetstone, please follow these care guidelines:
1. Keep the Stone Flat
Natural stones wear more slowly than synthetic stones, but regular flattening is still essential for controlled sharpening. Use a diamond lapping plate or a suitable flattening stone to maintain a flat, even surface. Avoid aggressive lapping unless necessary.
2. Use Water Only
Natural Japanese whetstones are designed to be used with water. Lightly wet the surface before use. Some stones benefit from a brief pre-wetting, while others should not be soaked for extended periods. Do not use oil or chemical additives.
3. Slurry Management
Depending on the stone, slurry may develop naturally during use. This is part of the sharpening process and should be managed gently. Avoid excessive pressure or artificial slurry generation unless intentionally desired.
4. Clean After Use
After sharpening, rinse the stone thoroughly with clean water to remove metal particles and residue. Use a soft brush if needed. Do not use soap, detergents, or abrasive cleaners.
5. Dry Slowly and Naturally
Allow the stone to air dry completely in a shaded, well-ventilated area. Avoid direct sunlight, heaters, or rapid temperature changes, as natural stones can crack if dried too quickly.
6. Store with Care
Store the stone in a dry, stable environment. Avoid damp locations and protect the stone from impacts or sudden temperature changes. If stored long-term, ensure the stone is fully dry before placing it in a box or wrapping.
7. Inspect Before Use
Before each use, rinse the surface and ensure it is free from dust, grit, or foreign particles. Any contamination may cause scratches on the blade and compromise sharpening results.
By following these guidelines, your natural whetstone will retain its unique sharpening characteristics and provide consistent, controlled results over time.
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