These beautifully crafted Japanese Sumitsubo carpenter’s lines are similar to the familiar chalk line, only they use ink grains dissolved in water instead of chalk. The ink leaves a much finer line.
You prepare the Sumitsubo by soaking cotton wadding in an ink solution and drawing the silk line through the soaked cotton. Then you tension the line and snap it, like a normal chalk line.
The plainer but still elegant model runs about $75 to $100. The more elaborately carved “Drinking Dragon” runs more in the $300 price range.