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The Kanna Finish: How to Get Glass-Smooth Surfaces in Wood Without Sandpaper or Varnish
The traditional Japanese woodworking technique of using *kanna* (handplanes and spokeshaves) offers an alternative to sandpaper for achieving incredibly smooth, glass-like finishes on wooden furniture. Unlike Western planes made with cast-iron or bronze bodies, *kanna* are constructed with wooden bodies that support an iron cutter. This method is employed by craftspeople like Toshio Tokunaga and his apprentices, who deliberately avoid sandpaper in their furniture production. They contend that sandpaper abrades the natural grain of wood, creating an artificial smoothness that diminishes the wood's inherent characteristics. In contrast, the *kanna* precisely shaves off successive layers of wood, thereby preserving its natural appearance.
A key distinction lies in the action of the tools: *kanna* blades cut, while sandpaper tears. This fundamental difference results in a superior finish from *kanna*, perceptible both microscopically and to the touch. Tokunaga, a master craftsman, not only utilizes *kanna* but also designs and fabricates his own tools, ranging from those for initial roughing work to specialized planes for fine, final shavings. His extensive collection of *kanna* encompasses a wide array of shapes, enabling him to expertly handle various contours—flat, concave, and convex—required in his furniture designs.
The *kanna* technique produces a distinct finish that many consider to be more authentic and natural than finishes achieved with sandpaper. While the final appearance can be incredibly smooth, the discussion within the woodworking community often revolves around whether a true 'glass-like' gleam is achieved solely through planing or if it requires additional elements like natural oils from handling or even a minimal finish. Some experts suggest that while *kanna* provides an exceptionally smooth surface, a highly reflective, glossy finish might also be influenced by factors such as burnishing or the presence of oils, similar to how western woodworking scrapers, when properly sharpened, can achieve comparable results by shaving thin layers.
The efficacy of the *kanna* finish relies heavily on the meticulous maintenance of the blades, which are regularly sharpened on waterstones by apprentices. The irons themselves are not mass-produced but are custom-made locally, highlighting the specialized nature of these tools. This commitment to traditional methods and bespoke tooling underscores a philosophy that prioritizes the natural beauty and integrity of the wood, offering an enduring finish that respects the material's innate qualities.
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