The **Naniwa Aotoishi sharpening stone grain 2000** is a large sharpening stone to sharpen your blunt knives. Grain 2000 is a very practical grain size. Coarse enough to quickly sharpen used knives and fine enough to end up with really sharp knives. Because you often use a sharpening stone with this grain size, this sharpening stone will also quickly wear out. To guarantee a long life Naniwa made sure that this sharpening stone is extra thick. At least twice as thick as your average sharpening stone!
## The Green Brick of Joy
Throughout the years the Aotoishi become more and more popular. Not only due to the thickness of the stone, but also because the stone is so efficient and versatile. The name Aotoishi refers to the green colour and the fact that it is a sharpening stone. Amongst its many fans the Aotoishi is, however, often simply called the ‘Green Brick of Joy’.
## Use and maintenance
The Naniwa Aotoishi is a water stone. This means you have to submerge it in water a couple minutes before use. As you use the stone it is key you make sure it stays wet. With this stone it is important to regularly lap the stone with a [lapping stone](/en/ct/lapping-stones.htm). After use, allow the stone to dry at room temperature.
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