Ohira Uchigumori - natural Japanese sharpening whetstone (内曇砥)

High quality Uchigumori Natural Japanese a stone quarried from the famous Ohira quarry in Kyoto, Japan. These stones are traditionally used final finishing and polishing of blades, especially for Japanese forged knives, swords and high-end tools.

"Uchigumori stones are famous for their a delicate grinding sensation and the ability to create unique kasumi (fog) or blurred contrast between the harder steel of the blade and the softer side, which is highly appreciated by professional craftsmen and knife enthusiasts.

Characteristics:

• 🇯🇵 Origin: Ohira, Kyoto Prefecture, Japan
• 🪨 Type: Natural Japanese water stone (Uchigumori - 内曇砥)
• 🌿 Uses: Final polishing (finishing stone)
• ✨ Roughness: Approximately 6000-8000+ (natural, not standardised)
• 🧱 Hardness: Medium to soft (depending on the piece)
• 💧 Use with water only, no oil

Features:

• Creates a classic kasumi effect on a Japanese blade
• Very soft sharpening sensation, controlled abrasive
• Suitable for both professionals and collectors seeking an authentic Japanese finish
• Each stone is a unique piece, with a distinctive texture and structure

📝 Remark: Uchigumori stones are often used in combination with nagura (a finer auxiliary stone) to form a slurry layer that improves the polishing effect. Due to their natural nature, they can be minor cracks, layering or natural inclusionsnot affecting use.