Coticule and Belgian Blue Water

Coticule and Belgian Blue Water

Among the natural stones for sharpening, a considerable place covers the stones, the Belgian Blue Waterstone (often abbreviated as BBW) and the Coticule.

The use of water is water: before affiliation it is necessary to wet the stone for a minute or two. It is not necessary to leave the stone a bath for a long time, it takes just one minute to wet the surface.
To obtain an excellent sharpening speed it is important to form a slurry, an emulsion of stone and water. This is how you can get a small polygonal stone, called Bout.

Belgian Blue Waterstone o BBW

The stone in question is of a color tending to blue precisely, and its supposed grain is 4000-5000, which in the American scale would correspond to a 1200-1800. It can be the last stone step in the sharpening of a knife, or the penultimate for the sharpening of a razor.


The stone in question looks like the classic double grain, then two-tone, in reality the only usable part is the yellow one, since they are glued to a layer of slate (useless for sharpening) to improve its resistance characteristics. Its alleged grain is 6000-8000.

It is classified into three classes: Normal, Selected and Kosjer.
• Normal is suitable for sharpening carpentry tools;
• Selected is suitable for high precision instruments;
• Kosjer is a stone of excellent performance, almost entirely imported into Israel, where it is used to sharpen the instruments used by the rabbis for circumcision

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