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Before cutting it of I tried to make slurry with my coticule slurry stone, but then the razor became more dull then it was before... but it was finaly cutting ! ! (the coticule slurry i guess..) ...

well people, today i have cut a piece of it because it was tooo slow. And it is quite a fast stone with slurry on it!

Well, I have been learning and trying, and it seems to be a nice finisher.
I'm using it whitout a slurry becouse I don't have another stone like this, and I don't want to cut a piece of it.
The...

I have no picture before lapping, but I have taken one from the backside.
I have tried to hone on it and I must say it really polishes the edge.

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So if it could be a thuringian, I can put a razor on it safely?

The dimensions are:
195(aprox)*45*20mm

I have found a hone at my fathers place wich I can't find any information about on the internet.
The box says: "Portanigra" all the info I'm getting is about a monument in Germany - Trier.
I have...