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If you want to use a rubbing stone on a coticule or a blue belgian, try a Cotigura stone which is a piece of coticule. The Nagura you're referring to is a piece of chalk and a number of my customers...

The nagura stone is a piece of chalk. It provides some lubricity to the japanese stones which are harder than the belgian stones and need the nagura to start the slurry. The belgian stones can get a...