Washing the Inkstone — Care Is the End of the Practice

Wash It the Same Day

Brushes shed their hairs eventually. Paper is finished after a single sheet. Even an inkstick grows shorter as you grind. Of the four tools, only the inkstone — the suzuri — lasts a lifetime, provided you never mistreat it. That is why I think of caring for it not as chores but as the end of the day's practice.

My one rule: wash it the same day I use it. The reason is shukuboku, leftover ink. Ink left in the stone dries overnight into a hard film. Scrape at it the next morning and you tear away not only the ink but the hoho — the microscopic roughness of the grinding surface that shaves the inkstick into pigment. A stone whose hoho is crushed will only ever yield thin, weak ink, no matter how long you grind. And a stone that cannot write is worse than a brush that cannot: your only option is to buy another.

Old ink has its own smell — the faintly sour odor of aged glue, the nikawa that binds the soot. When that glue begins to turn, I take it as a warning that the surface is about to suffer.

The Whole Method Is "Stroke Gently"

The cleaning itself is almost disappointingly simple. Pour lukewarm water onto the stone and stroke the grinding face with a fingertip or a soft sponge. Not hot water — stone hates sudden changes in temperature. One cold winter morning I poured near-boiling water onto a chilled stone and a crack ran along the rim. Since then it is always body-warm water, nothing more.

What you must not do matters more. Never scrub with a stiff brush, never use detergent, never soak it for long. A brush crushes the surface; detergent seeps in and dulls the ink's color; a long soak weakens the stone itself. My own stone is an amehata stone from the mountains of Yamanashi, and Japanese stones are often on the soft side, so I keep my hand as light as I can.

Then dry it in the shade, in moving air. No hairdryer, no direct sun. Cracking a stone in a hurry to dry it is the saddest failure of all.

When the Surface Falls Asleep

Even so, years of use put the hoho to sleep. The ink comes off slowly; the same grinding time no longer reaches the same darkness. When that happens, I take fine wet-and-dry sandpaper (#1000 to #2000), wet it, and polish the grinding face in small circles — a dozen strokes or so, and the sleeping surface wakes and the ink flows again. Overdoing it is the danger; polish too much and the surface roughens and the ink turns coarse. I stop when a fingertip feels only the faintest catch. That same catch is how you judge a good stone when you choose one in the first place.

Wash, dry, occasionally polish. This quiet routine has the same quality of time as cleaning and shaping a brush. The few minutes of rinsing ink away are how I close the day's writing. Practice ends only when the tools are put away — and since I started believing that, I have trusted my own lines a little more. A hand that treats the stone with care, I think, moves with the same care on the paper.