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Asano Mikawa Nagura - Tenjo, Tokujo #97U654R47

Asano Mikawa Nagura - Tenjo, Tokujo #97U654R47

$125.00 USD
$125.00 USD
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dimensions

Approx.: 70mm x 35mm x 40mm
Weight: 150g

Classification


Origin / Type: Japanese Natural Slurry Stone (Jun Mikawa Shiro Nagura / 純三河白名倉).
Layer (Stratum): Tenjō (天上), typically used in mid-to-fine polishing and razor sharpening progressions.
Grade: Tokujō (特級 / Upper-Special Grade), indicating high purity and uniform grain texture.
Inspection Stamp: Authenticated with the Asano red seal (Ken-Asano / 檢淺野).


Description


Dimensions & Weight: Approx.: 70mm x 35mm x 40mm, with a wedge profile tapers to a flat working face; total weight is 150 g.
Appearance: Creamy off-white body displaying characteristic golden-tan namazu / natural skin patterning on the upper stamped surface.
Function: Used on top of a hard base whetstone (Awasedo) to create an abrasive slurry for straight razors, fine woodworking tools, and kitchen cutlery.


Evaluation


Condition: Excellent, near-mint. The inspection stamps and calligraphy are fully intact and legible. Sealed in transparent lacquer
Form Factor: Compact wedge cut with a flat base, perfectly sized as an ergonomic rubbing/slurry nagura.
Performance Quality: Free from visible toxic inclusions or hard quartz lines on the honing contact face.

care instructions

1. Preparation & Water Management
Splash-and-Go Only: Never soak your natural finishing stone in a water bath. Prolonged submersion softens the natural binders and risks cracking or delamination along natural mineral lines.
Surface Wetting: Mist or splash clean water onto the working face just before sharpening. Add water sparingly throughout your session to maintain a slick working surface.
Bench Placement: Place the stone on a non-slip rubber base or a dedicated wooden stone holder with gentle clamping pressure.
2. Slurry Generation & Sharpening
Soft to Medium Stones (Hardness 2.5–3.5): These stones naturally release their own slurry under light blade pressure. Let the auto-generated mud do the work; do not wash it away mid-session.
b Use a diamond plate (such as an Atoma 1200), a clean Tomo Nagura, or a Mikawa Nagura to raise a thin, milky slurry in 5 to 10 light circular passes before laying your blade flat.
Pressure & Technique: Maintain light, even pressure. Allow the semi-rounded silica particles in the slurry to break down naturally—this self-refining action creates the signature toothy edge and cloudy kasumi finish.
Slurry Thickness: If the mud becomes too sticky or pasty, add a few drops of water. If it is too thin, work the stone lightly to concentrate the abrasive particles.
3. Cleaning, Drying & Long-Term Care
Rinse Clean: When finished, gently rinse off steel swarf and residual slurry using room-temperature tap water. Do not use dish soap, detergents, or hot water.
Air Dry Indirectly: Wipe the stone dry with a clean towel and allow it to dry completely at room temperature, away from direct sunlight, heating vents, fans, or freeze-thaw cycles.
Storage: Store the completely dry stone flat on a shelf in a climate-controlled room. Avoid enclosing a damp stone in an airtight plastic box.
Edge Lapping: Keep the working surface flat by lightly dressing it with a fine diamond plate (Atoma 1200 or 400) under running water when dish patterns begin to form. Chamfer the outer top perimeter edges lightly to prevent edge chipping during blade passes.

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